15 Best PC Power Supplies Under $300, Compared
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Choosing the best PC power supplies under $300 requires matching continuous wattage, efficiency ratings, and chassis dimensions to your hardware setup. We compared 15 products based strictly on the specifications published on their listings. The EVGA SuperNOVA G2 1300W Fully Modular PSU leads our list because its 1300W capacity, fully modular design, and 10-year warranty provide dependable power delivery for demanding systems.
This guide helps you decide on the right form factor, energy efficiency level, and cable configuration for your specific desktop build.
Quick picks
The best fit for you
- You build a high-wattage multi-GPU desktop system EVGA SuperNOVA G2 1300W Fully Modular PSU It provides 1300W of capacity with an 80 Plus Gold efficiency rating.
- You want maximum energy efficiency in your build EVGA Supernova 850 T2 850W Titanium PSU It features an 80 Plus Titanium rating for high electrical efficiency.
- You run a graphics card requiring PCIe 5.1 Seasonic Vertex 1000W Platinum ATX 3.1 PSU It includes native PCIe 5.1 connectivity paired with the ATX 3.1 standard.
Our 15 picks
EVGA SuperNOVA G2 1300W Fully Modular PSU
Best for: high-wattage multi-GPU desktop systems
- Wattage
- 1300W
- Efficiency Rating
- 80 PLUS Gold
- Modularity
- Fully Modular
- Fan Size
- 140mm
- Warranty
- 10 Year
- Dimensions
- 7.4 × 12 × 11.2 inches
The EVGA SuperNOVA 1300 G2 is a 1300-watt power supply built for power-heavy desktop builds. It features an 80 PLUS Gold efficiency rating, fully modular cabling, and a 140mm double ball bearing fan. Built-in electrical protections include OVP, UVP, OCP, OPP, and SCP. It suits you if you run multi-GPU configurations or demanding hardware needing high continuous wattage backed by a 10-year warranty.
Pros
- 1300W continuous output for multi-GPU setups
- 80 PLUS Gold certified with up to 90% efficiency
- Fully modular cable design
- 140mm double ball bearing cooling fan
- 10-year warranty with OVP, UVP, OCP, OPP, and SCP protections
Cons
- Requires included cables; incompatible with third-party cables
- Heavy unit at 8 pounds
- 80 PLUS Gold efficiency rather than Platinum or Titanium
Good fit if
- You need 1300W of capacity for multi-GPU setups or high-draw components.
- You prefer fully modular cables to simplify case airflow and cable routing.
- You want a 10-year manufacturer warranty with full hardware protection circuits.
Skip if
- You plan to use custom third-party modular power cables.
- You prefer higher 80 PLUS Platinum or Titanium efficiency levels.
Verdict: EVGA SuperNOVA 1300W Gold Fully Modular PSU delivers high 1300W capacity, complete modularity, and heavy-duty protections for power-intensive PC builds. A 10-year warranty and a 140mm dual ball-bearing fan secure dependable long-term operation.
EVGA Supernova 850 T2 850W Titanium PSU
Best for: maximum energy efficiency in 850W PC builds
- Wattage
- 850W
- Efficiency Rating
- 80 PLUS Titanium
- Modularity
- Fully Modular
- Fan Size
- 140mm
- Warranty
- 10 Year
- Dimensions
- 7.09 × 5.91 × 3.35 inches
The EVGA Supernova 850 T2 is a fully modular 850-watt power supply built for high electrical efficiency. It delivers 80 PLUS Titanium certification, reaching up to 94 percent efficiency at standard 115-volt loads. A 140mm double ball bearing fan with an ECO mode handles cooling, while full modularity lets you connect only the cables you need. It suits you if you run a high-performance system and prioritize top-tier power efficiency and extensive protection circuitry.
Pros
- 80 PLUS Titanium certified with up to 94% efficiency under typical 115V loads
- Fully modular cable design
- 140mm double ball bearing fan with ECO mode
- Comprehensive protection suite including OVP, UVP, OCP, OPP, SCP, and OTP
- 10-year manufacturer warranty
Cons
- Longer 7.09-inch chassis requires extra depth clearance in PC cases
- Heavier unit at 8 pounds
Good fit if
- You want maximum efficiency from an 80 PLUS Titanium certified unit.
- You prefer fully modular cabling for a clean system layout.
- You have a computer case that accommodates a 7.09-inch power supply depth.
Skip if
- You need more than 850 watts of continuous output for multi-GPU setups.
- You have a compact case with tight power supply clearance.
Verdict: EVGA Supernova 850 T2 850W Titanium PSU delivers top-tier 80 PLUS Titanium efficiency with fully modular cabling and a 10-year warranty. Its 7.09-inch length requires a chassis with sufficient clearance, but it provides robust heavy-duty circuit protection and quiet cooling.
EVGA Supernova 1300 G+ 1300W Gold PSU
Best for: demanding PC builds needing 1300W capacity
- Wattage
- 1300W
- Efficiency Rating
- 80 PLUS Gold
- Modularity
- Fully Modular
- Warranty
- 10 Year
- Dimensions
- 3.4 × 5.9 × 7.87 inches
- Weight
- 5 pounds
The EVGA Supernova 1300 G+ 1300W Gold PSU is a fully modular power supply built for power-heavy desktop configurations. It delivers 1300 watts of continuous output with 80 PLUS Gold efficiency and uses 100% Japanese capacitors alongside a DC-DC converter design. You get quiet cooling from a fluid dynamic bearing fan with an ECO mode, plus a 10-year warranty. It suits you if you need high continuous wattage for demanding hardware.
Pros
- 1300W continuous output with 80 PLUS Gold efficiency
- Fully modular cable design
- 100% Japanese capacitors with DC-DC converter
- Fluid dynamic bearing fan with ECO mode
- 10-year manufacturer warranty
Cons
- Gold efficiency rating rather than Platinum or Titanium
- Long 7.87-inch dimension requires adequate chassis space
Good fit if
- You need 1300W of total output for high-draw hardware.
- You want fully modular cables to simplify routing and airflow.
- You want long-term coverage backed by a 10-year warranty.
Skip if
- You require higher Platinum or Titanium efficiency levels.
- You build in a compact case that cannot fit a 7.87-inch power supply.
Verdict: EVGA Supernova 1300 G+ 1300W Gold PSU delivers reliable 1300W capacity with fully modular cabling, Japanese capacitors, and quiet cooling. It gives you massive wattage backed by a 10-year warranty for high-demand desktop builds.
Corsair RM550x 550W 80 Plus Gold PSU
Best for: mid-range and low-power desktop builds
- Wattage
- 550W
- Efficiency Rating
- 80 PLUS Gold
- Modularity
- Fully Modular
- Fan Size
- 135mm
- Form Factor
- ATX
- Dimensions
- 6.3 × 5.91 × 3.39 inches
The Corsair RM550x is a fully modular ATX power supply offering 550 watts of continuous output with an 80 Plus Gold efficiency certification. It features a 135mm magnetic levitation cooling fan with a Zero RPM mode for silent operation at low loads, alongside 105°C Japanese capacitors. This unit suits you if you are building an entry-level to mid-range PC setup and want dependable power delivery without excess wattage.
Pros
- 80 Plus Gold efficiency rating
- Fully modular cable configuration
- 135mm magnetic levitation fan with Zero RPM mode
- 100% industrial-grade 105°C Japanese capacitors
- Ten-year manufacturer warranty
Cons
- 550W total output limits high-power hardware configurations
- Standard ATX casing is not suited for compact SFX enclosures
Good fit if
- You need a fully modular supply for a low- to mid-power desktop build.
- You prefer silent fanless operation under light and medium computing loads.
- You want a unit backed by a ten-year warranty and Japanese capacitors.
Skip if
- You run high-draw graphics cards requiring more than 550 watts.
- You are assembling a small-form-factor system that requires an SFX power supply.
Verdict: Corsair RM550x 550W Gold Fully Modular PSU delivers reliable, quiet operation with an 80 Plus Gold rating and high-grade Japanese capacitors. It provides an efficient, fully modular power source for moderate system builds that do not require high wattage.
SilverStone 1000W SFX-L Platinum Power Supply
Best for: high-wattage small-form-factor PC builds
- Wattage
- 1000W
- Efficiency Rating
- 80 Plus Platinum
- Modularity
- Fully Modular
- Fan Size
- 120mm
- Form Factor
- SFX
- Dimensions
- 5.12 × 4.92 × 2.5 inches
View on Amazon: SilverStone 1000W SFX-L Platinum Power Supply
The SilverStone 1000W SFX-L Platinum PSU is a compact power supply built for small-form-factor builds that demand high wattage. It delivers 1000W of continuous power with 80 Plus Platinum efficiency and an 83.3A single +12V rail. A 120mm dual ball bearing fan provides semi-fanless cooling at low loads, while fully modular cabling keeps your case clutter-free. It suits you if you need heavy-duty power inside a compact chassis.
Pros
- 1000W continuous output rated at 50℃ operating temperature
- 80 Plus Platinum efficiency rating
- 120mm dual ball bearing fan with semi-fanless silent operation
- All Japanese capacitors with an 83.3A single +12V rail
Cons
- Requires a separately purchased adapter for standard ATX mounting
- Longer 5.12-inch SFX-L footprint compared to standard SFX units
Good fit if
- You need 1000W of power inside an SFX-L compatible chassis.
- You want high Platinum efficiency with semi-fanless operation at low loads.
- You prefer fully modular cables to maximize airflow in a tight build.
Skip if
- You need native ATX mounting without buying a separate bracket.
- You have a tiny case that strictly requires standard SFX dimensions.
Verdict: SilverStone 1000W SFX-L Platinum PSU delivers high-wattage power and 80 Plus Platinum efficiency in a dense SFX-L design. It is a reliable choice for power-dense small builds that have room for a 120mm fan enclosure.
EVGA Supernova 1300 P+ 1300W Fully Modular PSU
Best for: high-draw workstations and multi-GPU systems
- Wattage
- 1300W
- Efficiency Rating
- 80+ Platinum
- Modularity
- Fully Modular
- Warranty
- 10 Year
- Dimensions
- 18.3 × 6.8 × 10.5 inches
View on Amazon: EVGA Supernova 1300 P+ 1300W Fully Modular PSU
The EVGA Supernova 1300 P+ is a 1300W fully modular power supply designed for high-demand computer builds. It carries an 80 PLUS Platinum certification, delivering at least 92 percent efficiency under typical loads. You get full modularity to keep case cables organized, alongside all-Japanese capacitors and a double ball bearing fan with an ECO mode for quiet operation. It suits you if you run power-heavy hardware needing massive headroom.
Pros
- 80 PLUS Platinum efficiency reaching 92% or higher under typical load
- 1300W continuous power capacity
- Fully modular cable design
- 100% Japanese capacitors with DC-to-DC converter design
- Double ball bearing fan with EVGA ECO Mode
Cons
- No ATX 3.0 or native 12VHPWR connectors listed in specifications
- Overkill capacity for standard mid-range desktop setups
Good fit if
- You need 1300W of output for power-heavy hardware configurations.
- You want 80 PLUS Platinum efficiency to reduce wasted power.
- You prefer fully modular cables to simplify routing.
Skip if
- You assemble a standard mid-range PC that requires lower wattage.
- You require native ATX 3.0 or PCIe 5.0 12VHPWR connections listed in specs.
Verdict: EVGA Supernova 1300 P+ 1300W Platinum PSU delivers massive 1300W output and high electrical efficiency for demanding system loads. Its fully modular interface and 10-year warranty back reliable, high-wattage power delivery.
EVGA Supernova 850W Platinum PSU
Best for: efficient, quiet 850W desktop PC builds
- Wattage
- 850W
- Efficiency Rating
- 80 PLUS Platinum
- Modularity
- Fully Modular
- Warranty
- 10 Year
- Dimensions
- 5.9 × 5.9 × 3.4 inches
- Weight
- 10.5 ounces
The EVGA Supernova 850W Platinum PSU delivers 850 watts of output with an 80 PLUS Platinum efficiency rating of 92 percent or higher under typical loads. It features a fully modular cable design, an Active Clamp and DC-DC converter, and a Fluid Dynamic Bearing fan equipped with an ECO mode. This unit suits you if you need reliable, high-efficiency power for a modern desktop setup.
Pros
- 80 PLUS Platinum efficiency rating of 92% or higher under typical loads
- Fully modular cable design simplifies airflow management
- Fluid Dynamic Bearing fan includes an ECO mode for quiet operation
- 10-year limited warranty coverage
Cons
- No PCIe 5.0 or ATX 3.0 standards listed in specifications
- 850W capacity offers less headroom than 1000W or higher alternatives
Good fit if
- You want an 80 PLUS Platinum unit for reduced thermal losses.
- You prefer a fully modular layout to eliminate unused internal cabling.
- You want zero-fan or quiet operation via a selectable ECO mode.
Skip if
- You need more than 850W of power for multi-GPU or extreme setups.
- You require explicit native ATX 3.0 or PCIe 5.0 connector support.
Verdict: EVGA Supernova 850W Platinum PSU provides high-efficiency power delivery and fully modular cable management backed by a 10-year warranty. It serves standard high-performance systems that operate comfortably within an 850W limit.
ASUS ROG Loki 850W Platinum White
Best for: white compact ATX 3.0 gaming builds
- Efficiency Rating
- 80 Plus Platinum
- Form Factor
- ATX
- Modularity
- Fully Modular
- ATX Version
- ATX 3.0
- Warranty
- 10 Year Warranty
- Dimensions
- 4.9 × 4.9 × 2.5 inches
The ASUS ROG Loki 850W Platinum White is a fully modular power supply designed for compact and high-efficiency builds. It delivers 850 watts of output with an 80 PLUS Platinum efficiency rating of up to 92 percent. You get ATX 3.0 compliance with an included 16-pin PCIe Gen 5.0 cable capable of delivering 600 watts. This model suits you if you need clean white aesthetics, low noise levels, and compact dimensions.
Pros
- 80 PLUS Platinum certified for up to 92% efficiency
- ATX 3.0 compliant with a 16-pin 600W PCIe 5.0 cable
- Lambda A noise certification under 25 dB
- 120mm PWM fan with Axial-tech cooling
- 10-year warranty coverage
Cons
- 850W capacity is lower than the 1000W and 1200W variations
- Compact 4.9-inch dimensions may require an adapter bracket in standard full-size chassis
Good fit if
- You need a white fully modular power supply for a compact build.
- You run a PCIe Gen 5.0 graphics card requiring up to 600W via a 16-pin cable.
- You want quiet operation certified below 25 dB.
Skip if
- You require 1000W or more for ultra-high-draw hardware.
- You prefer a black enclosure to match a dark interior.
Verdict: ASUS ROG Loki 850W Platinum White delivers quiet, highly efficient power delivery and native ATX 3.0 support in a compact footprint. It gives you 850 watts of output backed by a 10-year warranty.
ASUS ROG Loki 1000W SFX-L Platinum PSU
Best for: compact ATX 3.0 small-form-factor builds
- Wattage
- 1000W
- Efficiency Rating
- 80 PLUS Platinum
- ATX Version
- ATX 3.0
- PCIe Connector Type
- 16-pin PCIe
- Fan Size
- 120mm
- Form Factor
- SFX
The ASUS ROG Loki 1000W Platinum SFX-L PSU delivers high output in a compact 4.9-inch square profile. You get 1000W of total capacity, 80 PLUS Platinum efficiency reaching up to 92 percent, and ATX 3.0 compliance. It includes a 16-pin PCIe cable rated for up to 600W for modern graphics cards. This unit suits you if you are assembling a compact small-form-factor build that demands high wattage and tight thermal management.
Pros
- 1000W capacity with 80 PLUS Platinum efficiency
- ATX 3.0 compliant with 16-pin 600W PCIe cable
- Compact SFX-L dimensions measuring 4.9 by 4.9 inches
- 120mm PWM fan paired with internal ROG heatsinks
Cons
- Complies with ATX 3.0 rather than newer ATX 3.1
- SFX-L footprint requires chassis support for 4.9-inch length
Good fit if
- You need 1000W of power for a small-form-factor PC build.
- You run a PCIe Gen 5.0 graphics card requiring a 16-pin power connection.
- You prioritize 80 PLUS Platinum electrical efficiency up to 92 percent.
Skip if
- You need a standard full-size ATX chassis power supply.
- You require more than 1000W of power for multi-card or ultra-high-draw hardware.
Verdict: ASUS ROG Loki 1000W Platinum SFX-L PSU delivers 1000W of ATX 3.0 power with 80 PLUS Platinum efficiency in a compact frame. It supplies dedicated 600W Gen 5.0 graphics power for space-constrained systems.
Seasonic Vertex 1000W Platinum ATX 3.1 PSU
Best for: modern PCIe 5.1 graphics card builds
- Wattage
- 1000W
- Efficiency Rating
- 80 PLUS, Cybenetics Platinum A
- ATX Version
- ATX 3.1
- PCIe Connector Type
- 12V-2x6
- Fan Size
- 135 mm
- PCIe Version
- PCIe 5.1
This ATX power supply delivers 1000W of continuous power with an 80 PLUS and Cybenetics Platinum efficiency rating. It conforms to the ATX 3.1 standard and includes a native 12V-2x6 connector designed for PCIe 5.1 hardware. Built with Japanese capacitors and a 135 mm fluid dynamic bearing fan featuring hybrid fan control, this unit suits you if you are powering high-demand modern graphics cards and need clean, efficient power delivery.
Pros
- Native 12V-2x6 connector for PCIe 5.1 systems
- 80 PLUS and Cybenetics Platinum A efficiency certifications
- 135 mm FDB fan with hybrid fan control
- Built using 100% Japanese capacitors
Cons
- 1000W capacity is lower than the available 1200W model
- 6.3-inch depth requires adequate clearance in compact chassis
Good fit if
- You need a native 12V-2x6 connector for PCIe 5.1 components.
- You want Platinum-rated electrical efficiency with hybrid fan cooling.
- You require up to 1000W of power for modern high-load hardware.
Skip if
- You need more than 1000W of headroom for multi-GPU setups.
- You require a small form factor SFX power supply.
Verdict: Seasonic Vertex 1000W Platinum ATX 3.1 PSU delivers modern ATX 3.1 compatibility and high efficiency for demanding hardware. It provides reliable 1000W performance with native PCIe 5.1 cabling.
Seasonic Focus V3 GX-750 ATX 3.0 PSU
Best for: mid-range ATX 3.0 PC builds
- Wattage
- 750W
- Efficiency Rating
- 80 PLUS Gold
- Modularity
- Full-Modular
- ATX Version
- ATX 3.0
- PCIe Connector Type
- 12VHPWR
- Fan Size
- 135 mm
The Seasonic Focus V3 GX-750 is a fully modular 750-watt power supply built for modern hardware. It supports the ATX 3.0 standard and includes a dedicated 16-pin 12VHPWR PCIe cable for newer graphics cards. With an 80 PLUS Gold efficiency certification, a 135 mm fluid dynamic bearing fan, and a compact 140 mm casing, it suits you well if you need reliable power delivery in space-conscious mid-tower PC cases.
Pros
- Native ATX 3.0 support with included 16-pin 12VHPWR PCIe cable
- 80 PLUS Gold certified energy efficiency
- Compact 140 mm length fits smaller ATX enclosures
- 135 mm Fluid Dynamic Bearing fan provides cooling
Cons
- 750W total output limits headroom for top-tier dual-component power spikes
- Uses standard 80 PLUS Gold rather than Platinum or Titanium efficiency
- Follows ATX 3.0 rather than the newer ATX 3.1 revision
Good fit if
- You need native 12VHPWR power delivery for a modern PCIe Gen 5 graphics card.
- You want a fully modular power supply with a short 140 mm depth for better cable clearance.
- You run a mid-range system with a total power requirement under 750 watts.
Skip if
- You require 850W, 1000W, or higher capacity for high-draw hardware configurations.
- You specifically require 80 PLUS Platinum or Titanium level efficiency.
- You are targeting power supplies built to the updated ATX 3.1 specification.
Verdict: Seasonic Focus V3 750W ATX 3.0 Power Supply offers a compact 140 mm footprint, fully modular cables, and native 12VHPWR connectivity backed by a 10-year warranty. It provides dependable ATX 3.0 power delivery for modern mid-range PC systems.
be quiet! Straight Power 12 1500W Platinum PSU
Best for: high-wattage next-gen builds needing quiet ATX 3.1 power
- Wattage
- 1500W
- Efficiency Rating
- 80 PLUS Platinum
- ATX Version
- ATX 3.1, ATX 3.0
- PCIe Connector Type
- 12VHPWR, PCIe 6+2-pin
- Dimensions
- 7.09 × 5.91 × 3.39 inches
View on Amazon: be quiet! Straight Power 12 1500W Platinum PSU
The be quiet! Straight Power 12 1500W gives you 1500W of continuous power on a single 12V rail with 80 PLUS Platinum efficiency reaching up to 93.9%. Designed for high-load systems, it supports the ATX 3.1 standard and includes a native 12VHPWR connector alongside four PCIe 6+2-pin connections. It suits you if you need massive headroom for next-generation hardware and quiet cooling powered by a Silent Wings fan.
Pros
- 1500W continuous output with a single 12V rail capable of handling 2x power excursions
- 80 PLUS Platinum certified with energy efficiency up to 93.9%
- Native 12VHPWR connector plus four PCIe 6+2-pin connectors
- Silent Wings fan featuring a 6-pole motor and fluid-dynamic bearing
Cons
- Longer 7.09-inch depth requires extra space inside compact ATX cases
- Limited to four PCIe 6+2-pin connectors for traditional graphics cards
Good fit if
- You need 1500W continuous capacity for high-demand processors and graphics cards.
- You want ATX 3.1 compliance with native PCIe 5.0 12VHPWR support.
Skip if
- You have a compact chassis that cannot fit a 7.09-inch power supply depth.
- You require more than four standard PCIe 6+2-pin cables for your setup.
Verdict: be quiet! Straight Power 12 1500W Platinum PSU delivers massive continuous power and ATX 3.1 compatibility for heavy-duty builds. Its 80 PLUS Platinum efficiency and specialized fan design ensure steady, low-noise operation under demanding workloads.
FSP Hydro Ti Pro 1000W Titanium ATX 3.1 PSU
Best for: compact, ultra-efficient modern high-end PC builds
- Wattage
- 1000W
- Efficiency Rating
- 80 PLUS, Cybenetics Titanium
- Modularity
- Fully Modular
- ATX Version
- ATX 3.1
- PCIe Connector Type
- 12V-2x6, PCIe 6+2 Pin
- Fan Size
- 135mm
The FSP Hydro Ti Pro gives you 1000W of fully modular power backed by dual 80 PLUS and Cybenetics Titanium efficiency ratings. Built to the ATX 3.1 and PCIe 5.1 standards, it includes a dedicated 12V-2x6 connector alongside five standard PCIe 6+2 pin cables. Its compact 150mm length fits standard cases easily, making it a reliable match for your modern, high-draw graphics cards and space-conscious workstation or gaming builds.
Pros
- Dual 80 PLUS and Cybenetics Titanium efficiency certification
- ATX 3.1 and PCIe 5.1 compliant with native 12V-2x6 connector
- Compact 150mm length aids airflow in standard cases
- 135mm FDB fan with semi-fanless Zero-RPM mode
Cons
- 1000W ceiling provides less overhead than 1200W or 1300W options
- Zero-RPM mode relies on passive cooling until load triggers the fan
Good fit if
- You want top-tier Titanium efficiency in a 1000W capacity
- You need native ATX 3.1 and PCIe 5.1 power delivery for your GPU
- You require a shorter 150mm chassis depth for cleaner cable management
Skip if
- You need more than 1000W of headroom for multi-GPU setups
- You are assembling a basic low-wattage desktop build
Verdict: FSP Hydro Ti Pro 1000W Titanium ATX 3.1 PSU delivers exceptional electrical efficiency and modern connector standards in a compact footprint. It serves as a quiet, future-ready foundation for high-end PC builds.
NZXT C1200 Gold ATX 3.1 Power Supply
Best for: high-wattage gaming builds with modern graphics cards
- Wattage
- 1200 Watts
- Efficiency Rating
- 80 PLUS Gold
- Modularity
- Fully Modular
- ATX Version
- ATX 3.1
- PCIe Connector Type
- 12V-2x6
- Fan Size
- 135 mm
The NZXT C1200 is a fully modular 1200-watt ATX power supply designed for high-demand gaming systems. It conforms to the ATX 3.1 standard and includes a dedicated 12V-2x6 connector capable of routing up to 600 watts to graphics cards. When you run lighter tasks, its 135 mm fan stays silent below 50 percent load while 100 percent Japanese capacitors ensure steady power delivery.
Pros
- ATX 3.1 compliant with a 600W-rated 12V-2x6 connector
- Zero-fan mode runs silently below 50% load
- 100% Japanese capacitors for ripple noise reduction
- Fully modular cabling simplifies case management
Cons
- Carries an 80 PLUS Gold efficiency rating rather than Platinum or Titanium
- Standard 6.3-inch depth can be tight in compact cases
Good fit if
- You need 1200 watts of power and a dedicated 12V-2x6 connector for high-end graphics cards.
- You want zero fan noise when operating under 50% power draw.
Skip if
- You require 80 PLUS Platinum or Titanium efficiency levels.
- You need a compact SFX-sized power supply for a small-form-factor case.
Verdict: NZXT C1200 1200W ATX 3.1 Power Supply provides 1200 watts of fully modular power and a 600W 12V-2x6 cable suited for demanding graphics cards. Its zero-RPM fan profile ensures quiet operation during moderate workloads.
NZXT C1200 Gold 1200W ATX 3.1 Power Supply
Best for: high-wattage ATX 3.1 desktop builds
- Wattage
- 1200W
- Efficiency Rating
- 80 Plus Gold
- Modularity
- Fully Modular
- ATX Version
- ATX 3.1
- PCIe Connector Type
- 12V-2x6
- Fan Size
- 135mm
The NZXT C1200 Gold 1200W ATX 3.1 Power Supply delivers 1200 watts of fully modular power designed for demanding hardware setups. It complies with the ATX 3.1 standard and includes a dedicated 12V-2x6 connector capable of routing up to 600 watts to graphics cards. With an 80 Plus Gold efficiency rating and a 135mm fluid dynamic bearing fan that stops spinning below 50% load, it suits you if you run high-draw GPUs.
Pros
- ATX 3.1 compliance with up to 600W power delivery via a 12V-2x6 connector
- 135mm fluid dynamic bearing fan with Zero Fan Mode under 50% load
- 100% Japanese capacitors for hold-up time and low ripple noise
- Fully modular cable layout
Cons
- Rated for 80 Plus Gold efficiency rather than Platinum or Titanium
- 6.3-inch ATX chassis length is unsuitable for compact SFX cases
Good fit if
- You need 1200 watts of fully modular power for high-demand components.
- You run a modern graphics card requiring a 600-watt 12V-2x6 connector.
- You want silent operation at or below 50% load.
Skip if
- You require an efficiency rating higher than 80 Plus Gold.
- You are assembling a small-form-factor build that cannot fit a 6.3-inch ATX unit.
Verdict: NZXT C1200 Gold 1200W ATX 3.1 Power Supply gives you 1200 watts of modular power with native ATX 3.1 support and a 600-watt 12V-2x6 connector. It keeps noise down via a 50% zero-fan threshold, making it a reliable pick for high-wattage desktop systems.
Specifications side by side
| Spec | EVGA SuperNOVA G2 1300W Fully Modular PSU | EVGA Supernova 850 T2 850W Titanium PSU | EVGA Supernova 1300 G+ 1300W Gold PSU | Corsair RM550x 550W 80 Plus Gold PSU | SilverStone 1000W SFX-L Platinum Power Supply | EVGA Supernova 1300 P+ 1300W Fully Modular PSU | EVGA Supernova 850W Platinum PSU | ASUS ROG Loki 850W Platinum White | ASUS ROG Loki 1000W SFX-L Platinum PSU | Seasonic Vertex 1000W Platinum ATX 3.1 PSU | Seasonic Focus V3 GX-750 ATX 3.0 PSU | be quiet! Straight Power 12 1500W Platinum PSU | FSP Hydro Ti Pro 1000W Titanium ATX 3.1 PSU | NZXT C1200 Gold ATX 3.1 Power Supply | NZXT C1200 Gold 1200W ATX 3.1 Power Supply |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wattage | 1300W | 850W | 1300W | 550W | 1000W | 1300W | 850W | not specified | 1000W | 1000W | 750W | 1500W | 1000W | 1200 Watts | 1200W |
| Efficiency Rating | 80 PLUS Gold | 80 PLUS Titanium | 80 PLUS Gold | 80 PLUS Gold | 80 Plus Platinum | 80+ Platinum | 80 PLUS Platinum | not specified | 80 PLUS Platinum | 80 PLUS, Cybenetics Platinum A | 80 PLUS Gold | 80 PLUS Platinum | 80 PLUS, Cybenetics Titanium | 80 PLUS Gold | 80 Plus Gold |
| Modularity | Fully Modular | Fully Modular | Fully Modular | Fully Modular | Fully Modular | Fully Modular | Fully Modular | not specified | not specified | not specified | Full-Modular | not specified | Fully Modular | Fully Modular | Fully Modular |
| ATX Version | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | ATX 3.0 | ATX 3.1 | ATX 3.0 | ATX 3.1, ATX 3.0 | ATX 3.1 | ATX 3.1 | ATX 3.1 |
| PCIe Connector Type | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | 16-pin PCIe | 12V-2x6 | 12VHPWR | 12VHPWR, PCIe 6+2-pin | 12V-2x6, PCIe 6+2 Pin | 12V-2x6 | 12V-2x6 |
| Fan Size | 140mm | 140mm | not specified | 135mm | 120mm | not specified | not specified | not specified | 120mm | 135 mm | 135 mm | not specified | 135mm | 135 mm | 135mm |
| Warranty | 10 Year | 10 Year | 10 Year | not specified | not specified | 10 Year | 10 Year | not specified | not specified | not specified | 10 Year | not specified | 10-Year | not specified | not specified |
| Form Factor | not specified | not specified | not specified | ATX | SFX | not specified | not specified | ATX | SFX | ATX | ATX | ATX | not specified | ATX | ATX |
| PCIe Version | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | PCIe 5.1 | not specified | not specified | not specified | not specified | not specified |
| Recommended Use | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | Gaming | not specified |
| Connector | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | 12V-2x6 Connector | not specified |
| Size | 1300W | 850 Watt | 1300W | 550W | 1000W SFX12V | 1300W | 850W | 850W|White | 1000W|Black | 1000W | 750W | not specified | not specified | 80 Plus Gold ATX 3.1 Blanc | 80 Plus Gold ATX 3.1 Black |
| Dimensions | 7.4 × 12 × 11.2 inches | 7.09 × 5.91 × 3.35 inches | 3.4 × 5.9 × 7.87 inches | 6.3 × 5.91 × 3.39 inches | 5.12 × 4.92 × 2.5 inches | 18.3 × 6.8 × 10.5 inches | 5.9 × 5.9 × 3.4 inches | 4.9 × 4.9 × 2.5 inches | 4.9 × 4.9 × 2.5 inches | 6.3 × 5.9 × 3.4 inches | 5.5 × 5.9 × 3.4 inches | 7.09 × 5.91 × 3.39 inches | 5.91 × 5.91 × 3.39 inches | 6.3 × 5.91 × 3.54 inches | 6.3 × 5.91 × 3.39 inches |
| Weight | 8 pounds | 8 pounds | 5 pounds | 3.31 pounds | 3.06 pounds | not specified | 10.5 ounces | 4 pounds | 4 pounds | 5.95 pounds | 6.23 pounds | not specified | not specified | 8.11 pounds | 7.05 ounces |
| Color | Black | not specified | not specified | Black | not specified | Multicolor | not specified | ROG-LOKI-850P-SFX-L-WHITE-GAMING | ROG-LOKI-1000P-SFX-L-GAMING | not specified | not specified | not specified | Black | white | Black |
| Model | 120-G2-1300-XR | 220-T2-0850-X1 | 220-GP-1300-X1 | CP-9020197-NA | not specified | 220-PP-1300-X1 | 220-P5-0850-X1 | ROG-LOKI-850P-SFX-L-WHITE-GAMING | ROG-LOKI-1000P-SFX-L-GAMING | Vertex PX-1000 ATX 3.1 | ATX3-FOCUS-GX-750 | BN518 | not specified | PA-2G2BW-EU | PA-2G2BB-UK |
Trade-offs for power supplies Under $300
When you evaluate options Under $300, you balance efficiency rating against wattage and modern connector standards. Most models offer fully modular cabling, but you do not get ATX 3.1 or PCIe 5.1 across every option. High-wattage 1300W and 1500W units provide substantial output, yet they stop at 80 Plus Gold or Platinum efficiency rather than Titanium. Selecting a compact SFX or SFX-L form factor caps output at 1000W. You must decide whether your build prioritizes updated ATX versions, maximum wattage, or the highest efficiency rating.
- ATX version: Several high-wattage units lack ATX 3.0 or ATX 3.1 specifications.
- Efficiency rating: 80 Plus Titanium ratings do not extend to 1300W or 1500W models.
- Form factor: SFX and SFX-L designs top out at 1000W.
- PCIe version: Native PCIe 5.1 connectivity is absent on older platform revisions.
How We Picked These Supplies
To build this guide of 15 units, we track models that fit Under $300. You see technical data taken directly from published specifications and listing feature sets. We do not physically handle or test the hardware. The guide limits each product family to a single size or variant to keep comparisons direct.
We list products in stock first. Information updates at least daily to reflect current availability. Models move in or out of this guide as listings change over time. You can compare these published specifications to choose the right model for your build.
How to Choose the Best Power Supply
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Calculate Your System Wattage
You must match continuous wattage to your hardware demands. High-end processors and graphics cards require substantial headroom to prevent unexpected shutdowns under heavy load. A 550-watt unit like the Corsair RM550x suits mid-range builds with moderate power requirements, whereas dual-GPU configurations or workstations need 1000 watts to 1500 watts. Review the power draw of your components before deciding on a capacity. Giving your system extra wattage capacity ensures stable power delivery and accommodates future component additions without forcing an immediate unit replacement.
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Compare 80 PLUS Ratings
Efficiency ratings indicate how effectively a power supply converts wall alternating current into direct current for components. Units carry certifications such as 80 Plus Gold, 80 Plus Platinum, or 80 Plus Titanium. Higher tiers convert more electricity and generate less internal heat during demanding operations. The EVGA Supernova 850 T2 offers an 80 Plus Titanium rating, providing maximum efficiency for users running systems under sustained daily loads. If you want lower thermal output and reduced energy waste, prioritize Platinum or Titanium ratings over baseline Gold certifications.
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Select the Matching Form Factor
Your computer case dictates whether you need a standard ATX supply or a compact small-form-factor model. Standard ATX enclosures accept full-size units, but mini-ITX cases require SFX or SFX-L designs to fit into tight internal spaces. The EVGA SuperNOVA 850 GM provides an SFX chassis designed specifically for small builds without sacrificing output wattage. Verify your chassis specifications to see which mounting bracket and form factor it accepts. Installing an incorrect physical standard will prevent the power supply from mounting securely inside the frame.
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Measure Chassis Clearance Depth
Power supply length varies considerably across units, even within the standard ATX category. Compact ATX power supplies measure around 5.5 inches in length, while high-output models extend past 7 inches. The Seasonic Focus V3 GX-750 measures 5.5 inches long, fitting easily into compact cases with restricted shroud depth. Measure your chassis clearance before choosing a longer power supply. Leaving adequate space between the unit and your drive cages ensures you have room to route modular cables cleanly without bending connectors excessively.
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Evaluate Cable Modularity
Modular cabling determines how cleanly you can assemble your computer and manage internal airflow. Fully modular power supplies allow you to attach only the specific cables your hardware requires, leaving unused leads in the box. The EVGA Supernova 1300 G+ features fully modular cables, simplifying assembly in packed chassis configurations. Non-modular or semi-modular alternatives force you to tuck unused bundles into the basement of your case. For cleaner aesthetics and unrestricted internal airflow, pick a fully modular design that minimizes unnecessary clutter.
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Review Manufacturer Warranty Coverage
Warranty duration indicates the expected operational lifespan and component quality of a power supply. Premium units frequently provide extended coverage periods, giving you protection across multiple hardware upgrade cycles. The EVGA SuperNOVA G2 1300W includes a 10-year warranty, reflecting heavy-duty construction intended for long-term usage. Check the warranty terms specified by the manufacturer before finalizing your decision. Selecting a model backed by a lengthy warranty helps protect your investment if an internal component fails during regular desktop operation over several years.
Frequently asked questions
What is the difference between SFX and ATX power supplies?
An SFX power supply uses a significantly smaller physical footprint than a standard ATX unit. You choose an SFX model, such as the EVGA SuperNOVA 850 GM measuring 4.92 inches long, for compact computer cases. Standard ATX models like the Corsair RM550x measure 6.3 inches long and fit regular desktop enclosures that have ample interior room.
What is the advantage of an 80 Plus Titanium efficiency rating?
An 80 Plus Titanium rating represents the highest energy efficiency tier among standard desktop power supplies. You lose less incoming electrical power as heat during operation compared to Gold or Platinum units. Models like the EVGA Supernova 850 T2 and FSP Hydro Ti Pro deliver this top-level efficiency, keeping internal operating temperatures lower during heavy workloads.
Do you need a fully modular power supply for your PC build?
A fully modular power supply allows you to attach only the power cables your specific hardware configuration requires. You leave unnecessary cables in the box, which reduces clutter inside your computer case and simplifies cable management. Models like the Seasonic Focus V3 GX-750 and EVGA SuperNOVA G2 1300W feature completely detachable cable sets to streamline your assembly.
What is the highest wattage power supply in this guide?
The be quiet! Straight Power 12 provides the highest continuous output on this list at 1500 watts. You select this unit when powering high-demand desktop configurations that run power-intensive processors and multiple hardware components. It provides 80 PLUS Platinum electrical efficiency, ATX 3.1 compatibility, and an extended chassis length of 7.09 inches.
Which power supplies feature the ATX 3.1 standard?
Several options in this selection meet the ATX 3.1 platform design specification. You find native ATX 3.1 support on the Seasonic Vertex 1000W, the be quiet! Straight Power 12 1500W, the FSP Hydro Ti Pro 1000W, and both the black and white variants of the NZXT C1200.
What cooling fan size does the EVGA SuperNOVA G2 1300W use?
The EVGA SuperNOVA G2 1300W uses a 140mm dual ball-bearing cooling fan. You benefit from this larger fan size because it moves sufficient airflow across internal components without requiring excessive rotational speed. The dual ball-bearing assembly provides steady thermal dissipation to support continuous, high-wattage computing workloads.
What high-draw graphics card cable comes with the NZXT C1200?
The NZXT C1200 includes a dedicated 600-watt 12V-2x6 connector cable. You use this specialized cable to supply continuous power to modern graphics cards through a single modular connection. The unit also incorporates native ATX 3.1 architecture and a fully modular interface to keep your chassis wiring organized.