Best 850W PC Power Supplies: 15 Spec-Based Picks
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Finding the best 850W PC power supplies requires matching electrical efficiency, physical dimensions, and cable compatibility to your specific system requirements. We evaluated 15 models strictly using specifications published on their listings to help you choose the right unit.
The Corsair RM850x 850W Fully Modular ATX 3.1 PSU leads the group with native PCIe 5.1 connectivity and a dedicated 12V-2x6 connector designed for modern hardware. This guide helps you decide which form factor, efficiency rating, and connector layout suit your chassis clearance and component demands.
Quick picks
The best fit for you
- You need a standard ATX build with modern connectors. Corsair RM850x 850W Fully Modular ATX 3.1 PSU It supports ATX 3.1 and PCIe 5.1 with a native 12V-2x6 connector.
- You are building an all-white modern desktop computer. Corsair RM850x Shift 850W White ATX Power Supply Its white casing pairs with ATX 3.1 and PCIe 5.1 standards.
- You want the highest possible electrical efficiency rating. be quiet! Dark Power 13 850W Titanium PSU It features an 80 Plus Titanium rating and ATX 3.0 support.
- You are assembling a compact small-form-factor computer. EVGA SuperNOVA 850 GM SFX Power Supply It features an SFX form factor measuring 4.92 inches long.
Our 15 picks
Corsair RM850x 850W Fully Modular ATX 3.1 PSU
Best for: modern ATX builds needing PCIe 5.1 power
- Size
- 850W (what this guide is about)
- Wattage
- 850W
- Efficiency Rating
- Cybenetics Gold
- Modularity
- Fully Modular
- ATX Version
- ATX 3.1
- PCIe Connector Type
- 12V-2x6
View on Amazon: Corsair RM850x 850W Fully Modular ATX 3.1 PSU
The Corsair RM850x is a fully modular 850W ATX power supply built for modern PC systems. It features the ATX 3.1 standard and includes a dedicated 12V-2x6 PCIe 5.1 connector for modern graphics cards. The unit holds a Cybenetics Gold efficiency rating to manage energy use. This power supply suits you if you need clean cable management, modern connector standards, and dependable 850W capacity inside a standard ATX PC chassis.
Pros
- ATX 3.1 compliant with PCIe 5.1 support
- Dedicated 12V-2x6 power connector
- Fully modular cable design
- Cybenetics Gold efficiency rating
Cons
- Standard ATX form factor does not fit SFX cases
- No traditional 80 Plus rating listed in specifications
Good fit if
- You need a fully modular 850W power supply for a standard ATX case.
- You require ATX 3.1 compliance and a native 12V-2x6 connector.
- You want a Cybenetics Gold certified unit.
Skip if
- You build in a compact case requiring an SFX power supply.
- You require a power supply with an 80 Plus certification label.
Verdict: Corsair RM850x 850W ATX 3.1 Power Supply provides modern PCIe 5.1 connectivity and fully modular cabling for standard desktop builds. Its Cybenetics Gold rating and 850W output deliver balanced performance for current hardware.
Corsair RM850x Shift 850W White ATX Power Supply
Best for: modern white ATX builds needing PCIe 5.1
- Size
- 850W (what this guide is about)
- Wattage
- 850W
- Efficiency Rating
- 80 Plus Gold
- Modularity
- Fully Modular
- ATX Version
- ATX 3.1
- PCIe Connector Type
- PCIe 5.1
View on Amazon: Corsair RM850x Shift 850W White ATX Power Supply
The Corsair RM850x Shift 850W is an ATX power supply finished in white. You get modern power delivery with full ATX 3.1 compliance and native PCIe 5.1 support. Its 80 Plus Gold certification guarantees efficient electrical operation, while fully modular cabling keeps your interior tidy. Measuring 6.3 inches long, this unit suits you if you want updated standards, quiet Zero RPM operation, and clean cable management in an 850W desktop build.
Pros
- Compliant with ATX 3.1 and PCIe 5.1 standards
- Fully modular cable configuration
- 80 Plus Gold efficiency rating
- Zero RPM fan mode for silent low-load operation
Cons
- Efficiency is 80 Plus Gold rather than Platinum or Titanium
- White finish will not match dark internal themes
- 6.3-inch housing length requires verification in compact cases
Good fit if
- You need modern ATX 3.1 and PCIe 5.1 connectors for your components.
- You are assembling a white-themed desktop build.
- You want fully modular cables and a quiet Zero RPM mode.
Skip if
- You require an 80 Plus Platinum or Titanium efficiency tier.
- You need a standard black enclosure to match your chassis.
Verdict: Corsair RM850x Shift 850W White Power Supply provides updated ATX 3.1 and PCIe 5.1 compatibility in a clean, fully modular package. It offers reliable 80 Plus Gold efficiency and quiet operation for mid-to-high-wattage systems.
Thermaltake Toughpower Grand 850W Gold PSU
Best for: high-temperature continuous 850W operation
- Size
- 850W (what this guide is about)
- Wattage
- 850W
- Efficiency Rating
- 80 PLUS Gold
- Modularity
- Fully Modular
- ATX Version
- ATX 12V 2.3
- Fan Size
- 14cm
The Thermaltake Toughpower Grand is an 850W fully modular power supply designed for high-uptime environments. It holds an 80 PLUS Gold efficiency certification and is rated to deliver 850W of continuous power at temperatures up to 50°C. Inside, it uses 100% 105°C Japanese capacitors cooled by a 140mm dual ball bearing fan. This unit suits you if you need a durable supply built to handle demanding heat levels.
Pros
- Delivers 850W continuous output at up to 50°C operating temperature
- 80 PLUS Gold certified with 87% to 93% efficiency
- 100% 105°C Japanese electrolytic and solid-state capacitors
- Dual ball bearing 140mm fan designed for reduced friction
- Fully modular cabling configuration
Cons
- Built to ATX 12V 2.3 standards rather than newer ATX 3.0 specifications
- Lacks a native 12V-2x6 or 12VHPWR PCIe connector
Good fit if
- You need continuous 850W output in ambient temperatures reaching 50°C.
- You want 100% Japanese capacitors paired with a dual ball bearing fan.
- You prefer a fully modular layout to connect only required cables.
Skip if
- You need native ATX 3.0 or ATX 3.1 power support.
- You require a direct PCIe 5.0 12V-2x6 connector for modern graphics cards.
Verdict: Thermaltake Toughpower Grand 850W Gold PSU delivers reliable continuous output in hot ambient environments with its robust Japanese capacitors and 140mm ball-bearing fan. It remains a dependable pick if your build does not require newer ATX 3.0 power connections.
EVGA SuperNOVA 850W Platinum Power Supply
Best for: high-efficiency systems requiring durable internal components
- Size
- 850W (what this guide is about)
- Wattage
- 850W
- Efficiency Rating
- 80 PLUS Platinum
- Modularity
- Fully Modular
- Fan Size
- 140mm
- Warranty
- 10 Year
The EVGA SuperNOVA 850 P2 gives you 850 watts of continuous power with 80 PLUS Platinum efficiency, reaching 92 percent or higher under typical loads. It features a fully modular cable design, 100 percent Japanese capacitors, and a 140mm double ball bearing fan with ECO Mode. This supply suits you if you want high power efficiency and reliable internal components backed by a 10-year warranty.
Pros
- 80 PLUS Platinum certified efficiency (92% to 94% under typical loads)
- Fully modular cable design to minimize interior clutter
- 140mm double ball bearing fan with ECO Mode
- 100% Japanese capacitors with a 10-year warranty
Cons
- 6.5-inch casing length requires extra clearance in smaller cases
- Heavier chassis design at 7.95 pounds
- No native PCIe 5.0 or 12V-2x6 cables listed in specifications
Good fit if
- You want 80 PLUS Platinum efficiency for an 850W system.
- You prefer Japanese capacitors paired with a 10-year warranty.
- You need fully modular cables to simplify interior airflow.
Skip if
- You build in a compact case requiring a short power supply depth under 6.5 inches.
- You require native PCIe 5.0 12V-2x6 power connections out of the box.
Verdict: EVGA SuperNOVA 850 P2 Platinum Power Supply delivers high electrical efficiency and fully modular cabling supported by a 10-year warranty.
EVGA SuperNOVA 850 G+ 850W PSU
Best for: roomy ATX cases needing extended warranty coverage
- Size
- 850W (what this guide is about)
- Wattage
- 850W
- Efficiency Rating
- 80 Plus Gold
- Modularity
- Fully Modular
- Fan Size
- 135mm
- Warranty
- 10 Year
The EVGA SuperNOVA 850 G+ is an 850W power supply designed for standard desktop builds. It features 80 PLUS Gold efficiency reaching up to 92 percent, a fully modular layout that lets you attach only the cables you need, and a 135mm fluid dynamic bearing fan for cooling. This model suits you if you want dependable power with extensive built-in electrical protections and long-term 10-year warranty coverage for your system.
Pros
- 80 PLUS Gold certified efficiency up to 92 percent
- Fully modular cable configuration
- 135mm fluid dynamic bearing fan
- Heavy-duty protections including OVP, UVP, OCP, OPP, SCP, and OTP
- 10-year warranty
Cons
- Chassis length of 7.1 inches requires extra case clearance
- Total weight is relatively heavy at 7 pounds
- No PCIe 5.0 or 12V-2x6 connectors listed
Good fit if
- You need a fully modular 850W unit backed by a 10-year warranty.
- You have a PC case that comfortably accommodates a 7.1-inch power supply.
Skip if
- You build in a compact case where a 7.1-inch chassis causes clearance issues.
- You require native PCIe 5.0 or 12V-2x6 power connections.
Verdict: EVGA SuperNOVA 850 G+ Fully Modular PSU provides 80 PLUS Gold efficiency and a quiet 135mm FDB fan backed by a 10-year warranty. Its 7.1-inch depth makes it ideal for standard cases with ample clearance under the shroud.
EVGA SuperNOVA 850 GM SFX Power Supply
Best for: compact small-form-factor builds
- Size
- 850W (what this guide is about)
- Wattage
- 850W
- Efficiency Rating
- 80 PLUS Gold
- Modularity
- Fully Modular
- Warranty
- 10 Year
- Form Factor
- SFX
The EVGA SuperNOVA 850 GM delivers 850W of power in a compact SFX form factor measuring 4.92 inches wide and 2.48 inches tall. It features an 80 PLUS Gold efficiency rating, fully modular cabling, 100% Japanese capacitors, and an ECO mode with a fluid dynamic bearing fan. This unit suits you if you build a small-form-factor PC or need high wattage inside a tight chassis with the included ATX bracket.
Pros
- SFX form factor with included ATX mounting bracket
- 80 PLUS Gold efficiency rating
- Fully modular cabling design
- ECO mode with fluid dynamic bearing fan
- 10-year warranty coverage
Cons
- No PCIe 5.0 or 12V-2x6 connectors listed in specifications
- Short SFX cables may require extensions in larger ATX cases
Good fit if
- You are building a compact small-form-factor system that requires an SFX power supply.
- You want fully modular cables to minimize clutter inside tight computer cases.
- You want the option to mount an SFX unit in an ATX chassis using an included bracket.
Skip if
- You need native PCIe 5.0 12V-2x6 power connections for your hardware.
- You are using a full-tower ATX case where compact SFX cables cannot reach components.
Verdict: EVGA SuperNOVA 850 GM SFX Power Supply delivers 850W of Gold-rated, fully modular power in a compact SFX footprint backed by a 10-year warranty.
EVGA 850 G6 Fully Modular PSU
Best for: compact ATX builds needing long warranty coverage
- Size
- 850W (what this guide is about)
- Wattage
- 850W
- Efficiency Rating
- 80 Plus Gold
- Modularity
- Fully Modular
- Warranty
- 10 Year
- Dimensions
- 5.5 × 5.91 × 3.4 inches
The EVGA 850 G6 delivers 850W of power with an 80 Plus Gold efficiency certification. Its fully modular design lets you attach only the cables you need for your system, keeping case airflow clear. Internally, it features a full-bridge LLC resonant converter, DC-to-DC design, and Japanese capacitors. At 5.5 inches long, this unit fits easily into tight enclosures. It suits your build if you want high-efficiency output and a ten-year warranty.
Pros
- 80 Plus Gold certified with 91% typical efficiency
- 10-year warranty coverage
- Fully modular cable design
- Compact 5.5-inch casing depth
- 100% Japanese capacitors with full-bridge LLC resonant design
Cons
- No native PCIe 5.0 or 12V-2x6 connector listed
- 80 Plus Gold efficiency rather than Platinum or Titanium
Good fit if
- You need a compact 5.5-inch power supply for a tighter case.
- You want 850W output backed by a 10-year warranty.
- You prefer a fully modular layout with an FDB fan and ECO mode.
Skip if
- You need native PCIe 5.0 or 12V-2x6 power connections.
- You require 80 Plus Platinum or Titanium efficiency.
Verdict: EVGA 850 G6 850W Modular Power Supply pairs a compact 5.5-inch chassis with 80 Plus Gold efficiency and Japanese capacitors. It provides 850W of clean power supported by a 10-year warranty.
EVGA SuperNOVA 850 G7 Gold Modular PSU
Best for: compact PC cases needing 850W modular power
- Size
- 850W (what this guide is about)
- Wattage
- 850W
- Efficiency Rating
- 80 Plus Gold
- Modularity
- Fully Modular
- Warranty
- 10 Year
- Dimensions
- 5.1 × 5.9 × 3.4 inches
The EVGA SuperNOVA 850 G7 is an 850W fully modular power supply built with 100% Japanese capacitors and a half-bridge LLC resonant DC-DC design. At 5.1 inches long, it has a compact footprint that frees up space for cable management in standard ATX cases. With 80 Plus Gold efficiency and a fluid dynamic bearing fan featuring EVGA ECO Mode, this unit suits you if you need reliable power and quiet cooling backed by a 10-year warranty.
Pros
- 80 Plus Gold certified with up to 92% typical efficiency
- Compact 5.1-inch length simplifies case routing
- Fluid dynamic bearing fan with zero-RPM EVGA ECO Mode
- 10-year limited warranty coverage
Cons
- Does not list native ATX 3.0 or PCIe 5.0 connectors
- 80 Plus Gold efficiency rather than Platinum or Titanium
Good fit if
- You need a short 5.1-inch power supply to maximize clearance in your case.
- You want fully modular cables paired with 100% Japanese capacitors.
- You prefer quiet cooling with an automated semi-passive ECO fan mode.
Skip if
- You require native PCIe 5.0 or 12V-2x6 power connections for newer GPUs.
- You want Platinum or Titanium efficiency ratings.
Verdict: EVGA SuperNOVA 850 G7 Modular PSU delivers 850W Gold-rated efficiency in a compact 5.1-inch housing. It pairs tight DC-DC regulation and quiet fan behavior with a 10-year warranty for conventional modular PC builds.
MSI MPG 850W Gold ATX 3.1 Power Supply
Best for: Modern GPU builds needing ATX 3.1
- Size
- 850W (what this guide is about)
- Wattage
- 850W
- Efficiency Rating
- 80+ Gold
- Modularity
- Fully Modular
- ATX Version
- ATX 3.1
- PCIe Connector Type
- 12V-2x6
The MSI MPG 850W ATX 3.1 Power Supply is a fully modular unit designed for modern gaming systems. It delivers 850W of power with 80 PLUS Gold certified efficiency. Built to ATX 3.1 and PCIe 5.1 standards, it includes a dedicated 12V-2x6 connector for current graphics cards. You also get Japanese 105°C capacitors and a 10-year warranty, making it a dependable choice for standard ATX enclosures.
Pros
- Native 12V-2x6 cable supporting ATX 3.1 and PCIe 5.1 standards
- 80 PLUS Gold certified power efficiency
- Internal build uses 100% Japanese 105°C capacitors
- Fully modular cable design
- 10-year limited warranty coverage
Cons
- Efficiency capped at 80 PLUS Gold rather than Platinum or Titanium
- Standard ATX size will not fit SFX-only chassis
Good fit if
- You need native 12V-2x6 connector support for PCIe 5.1 hardware.
- You want fully modular cabling with Japanese 105°C capacitors.
- You prefer long-term protection with a 10-year warranty.
Skip if
- You require an 80 PLUS Platinum or Titanium efficiency rating.
- You are building inside a compact SFX-only small form factor case.
Verdict: MSI MPG 850W ATX 3.1 Power Supply pairs PCIe 5.1 compatibility with all-Japanese capacitors and a 10-year warranty. It provides dependable Gold-rated power delivery for modern graphics hardware.
Thermaltake Toughpower GF3 850W ATX 3.1 PSU
Best for: Modern ATX 3.1 high-power GPU builds
- Size
- 850W (what this guide is about)
- Wattage
- 850W
- Efficiency Rating
- 80 Plus Gold
- Modularity
- Full Modular
- ATX Version
- ATX 3.1
- PCIe Connector Type
- 12V-2x6
The Thermaltake Toughpower GF3 850W is a fully modular 80 Plus Gold power supply built to the ATX 3.1 standard. It features a native PCIe 5.1 12V-2x6 connector rated for up to 600W, designed to handle power excursions from modern graphics cards. A 135mm fan cools the unit inside a 6.3-inch chassis. You get flat modular cables with visual seating indicators, making it suitable for clean, modern high-draw PC builds.
Pros
- Native PCIe 5.1 12V-2x6 connector delivers up to 600W
- ATX 3.1 compliance handles up to 3x GPU power excursions
- Fully modular flat cables with two-tone seating indicators
- Large 135mm cooling fan
Cons
- 80 Plus Gold efficiency rather than Platinum or Titanium
- 6.3-inch chassis length requires more depth than compact ATX units
Good fit if
- You need a native 600W 12V-2x6 connection for an ATX 3.1 build.
- You want flat modular cables with visual connector seating aids.
- You run an 850W system requiring standard ATX clearance.
Skip if
- You need 80 Plus Platinum or Titanium efficiency ratings.
- You have a compact case requiring an ATX power supply under 6.3 inches long.
Verdict: Thermaltake Toughpower GF3 850W Gold ATX 3.1 delivers current ATX 3.1 power excursion handling and up to 600W via its native 12V-2x6 cable. It is a solid fully modular foundation for modern GPU systems.
SilverStone Extreme 850W Platinum SFX PSU
Best for: compact small-form-factor builds needing Platinum efficiency
- Size
- 850W (what this guide is about)
- Wattage
- 850W
- Efficiency Rating
- Cybenetics Platinum
- Modularity
- modular
- ATX Version
- ATX 3.0
- PCIe Connector Type
- 12VHPWR
The SilverStone Extreme 850W Platinum SFX Power Supply delivers 850W of power in a compact SFX footprint. It features Cybenetics Platinum efficiency, Japanese electrolytic capacitors, and SFX12V 4.0 compliance matching ATX 3.0 standards. You get fully modular flat cables and a native 12VHPWR connector rated at 450W. With an included ATX adapter bracket, this unit suits you if you need high efficiency and high wattage in small-form-factor builds or tight cases.
Pros
- Cybenetics Platinum efficiency certification
- Compact SFX dimensions with included ATX adapter bracket
- All Japanese electrolytic capacitors rated for 50°C continuous output
- Native 12VHPWR PCIe cable for ATX 3.0 compliance
Cons
- 12VHPWR connector is rated for 450W rather than 600W
- 92mm cooling fan is smaller than typical 120mm ATX fans
Good fit if
- You are assembling a small-form-factor system that requires an SFX unit.
- You want Cybenetics Platinum efficiency and flexible flat modular cables.
- You need ATX 3.0 compliance with an included ATX mounting bracket.
Skip if
- You require a 600W-rated 12VHPWR cable for your graphics card.
- You prefer standard full-size ATX units with larger 120mm fans.
Verdict: SilverStone Extreme 850W Platinum SFX Power Supply delivers high-tier Cybenetics Platinum efficiency in a dense SFX footprint. It provides ATX 3.0 compliance and flexible modular cabling for compact or adapter-mounted standard builds.
be quiet! Dark Power 13 850W Titanium PSU
Best for: maximum efficiency in ATX 3.0 builds
- Size
- 850W (what this guide is about)
- Wattage
- 850W
- Efficiency Rating
- 80 PLUS Titanium
- ATX Version
- ATX 3.0
- PCIe Connector Type
- 12VHPWR, 6+2-pin
- Dimensions
- 6.89 × 5.91 × 3.39 inches
The be quiet! Dark Power 13 is an 850W ATX 3.0 power supply built with 80 PLUS Titanium efficiency, reaching up to 95.4 percent efficiency. It features a native 12VHPWR connector alongside PCIe 6+2-pin cables and divides power across four independent 12V rails. If you want maximum electrical efficiency and modern GPU support in a full-sized ATX chassis, this unit provides clean power delivery for your setup.
Pros
- 80 PLUS Titanium certification reaching up to 95.4% efficiency
- Native PCIe 5.0 12VHPWR connector alongside 6+2-pin PCIe connectors
- ATX 3.0 compliant to handle brief power excursions up to double rated wattage
- Four independent 12V rails for targeted power distribution
Cons
- Length of 6.89 inches is longer than standard ATX power supplies
- Multi-rail 12V design requires distributing heavy GPU loads across specific rails
Good fit if
- You want 80 PLUS Titanium efficiency up to 95.4% in an 850W unit.
- You need native 12VHPWR connectivity for an ATX 3.0 graphics card.
- You have a PC case that accommodates its 6.89-inch chassis depth.
Skip if
- You prefer a single 12V rail configuration rather than four independent rails.
- You build in a compact case where power supply clearance is under 6.89 inches.
Verdict: be quiet! Dark Power 13 850W Titanium PSU delivers top-tier 80 PLUS Titanium efficiency and ATX 3.0 compatibility across four dedicated 12V rails. It is an excellent match if you want minimal power waste and have room for its 6.89-inch depth.
ASUS TUF Gaming 850W Gold Power Supply
Best for: durable ATX 3.1 modern gaming rigs
- Size
- 850W (what this guide is about)
- Wattage
- 850W
- Efficiency Rating
- 80 Plus Gold
- ATX Version
- ATX 3.1
- PCIe Connector Type
- 16-pin PCIe
- Recommended Use
- Gaming
The ASUS TUF Gaming 850W ATX 3.1 Power Supply provides 850 watts of output for modern gaming builds. It features an 80 Plus Gold efficiency rating, Japanese capacitors, and ATX 3.1 compliance. You receive a dedicated 16-pin PCIe cable capable of delivering up to 600W to PCIe Gen 5.0 graphics cards. Its protective PCB coating and dual ball bearing fan make it a dependable fit if you prioritize component longevity.
Pros
- ATX 3.1 compliant with 16-pin PCIe cable delivering up to 600W
- 80 Plus Gold efficiency certified with Japanese capacitors
- Protective PCB coating guards against moisture, dust, and temperature
- Dual ball fan bearings designed for extended operational life
Cons
- 80 Plus Gold rating offers lower efficiency than Platinum alternatives
- Fixed 850W capacity limits headroom for dual high-draw hardware configurations
Good fit if
- You run a modern GPU requiring a 16-pin PCIe cable rated up to 600W.
- You operate your system in dusty or humid environments needing PCB protection.
- You want durable dual ball bearings in your power supply fan.
Skip if
- You require 80 Plus Platinum or Titanium efficiency levels.
- You need more than 850W of power for extreme multi-GPU workloads.
Verdict: ASUS TUF Gaming 850W ATX 3.1 Power Supply delivers standard ATX 3.1 compliance with up to 600W via its 16-pin PCIe cable. It combines 80 Plus Gold efficiency with dual ball fan bearings and a coated PCB for resilient daily operation.
Thermaltake Toughpower GF A3 850W Gold PSU
Best for: ATX 3.1 builds with 450W PCIe hardware
- Size
- 850W (what this guide is about)
- Wattage
- 850W
- Efficiency Rating
- 80 Plus Gold
- Modularity
- Fully Modular
- ATX Version
- ATX 3.1
- PCIe Connector Type
- 12V-2x6
The Thermaltake Toughpower GF A3 850W delivers 850 watts of power with 80 Plus Gold efficiency. Built to Intel ATX 3.1 standards, it includes a dedicated 450W 12V-2x6 PCIe 5.1 connector for modern graphics cards. Fully modular flat cables simplify case routing and cable management. This unit suits you if you are building an updated ATX desktop system that requires standard Gold-rated efficiency and native power delivery for PCIe 5.1 hardware.
Pros
- Native 12V-2x6 PCIe 5.1 connector rated for 450W
- Intel ATX 3.1 standard compliance
- Fully modular layout with low-profile flat cables
- 10-year manufacturer warranty
Cons
- 12V-2x6 connector delivers up to 450W rather than 600W
- Efficiency is 80 Plus Gold rather than Platinum or Titanium
Good fit if
- You need a native 12V-2x6 connection for graphics hardware up to 450W.
- You want fully modular flat cabling for clean cable management.
- You prefer an ATX 3.1 platform backed by a 10-year warranty.
Skip if
- You need a single 12V-2x6 cable rated for 600W.
- You require higher 80 Plus Platinum or Titanium efficiency levels.
Verdict: Thermaltake Toughpower GF A3 850W ATX 3.1 PSU provides native ATX 3.1 and PCIe 5.1 support alongside 80 Plus Gold efficiency. It gives you fully modular flat cabling and a 10-year warranty for modern desktop hardware.
FSP Dagger Pro 850W SFX Power Supply
Best for: compact Mini-ITX and small-form-factor gaming builds
- Size
- 850W (what this guide is about)
- Wattage
- 850W
- Efficiency Rating
- 80 PLUS Gold
- Modularity
- Fully Modular
- ATX Version
- ATX 3.1
- PCIe Connector Type
- 12V-2x6
The FSP Dagger Pro 850W is a compact SFX power supply designed for small-form-factor builds. It delivers 850 watts of power with 80 PLUS Gold efficiency and supports the ATX 3.1 standard alongside a PCIe 5.1 12V-2x6 connector. You get fully modular cabling and an included ATX bracket adapter for flexible mounting. A 92mm ball-bearing fan stays off below 20% load, making it suitable if you need high wattage in tight Mini-ITX cases.
Pros
- SFX form factor includes an ATX bracket adapter
- Native ATX 3.1 and PCIe 5.1 support with 12V-2x6 connector
- 80 PLUS Gold efficiency with 100% Japanese capacitors
- Semi-fanless mode shuts off the 92mm fan under 20% load
Cons
- Smaller 92mm cooling fan compared to standard ATX power supplies
- Zero-fan passive cooling mode only applies below 20% load
Good fit if
- You are building a compact Mini-ITX or Micro-ATX system.
- You need an ATX 3.1 unit with a dedicated 12V-2x6 power connector.
- You want fully modular cables to save clearance inside small enclosures.
Skip if
- You prefer a standard ATX power supply with a larger 120mm or 140mm fan.
- You want a semi-fanless threshold that remains inactive beyond 20% load.
Verdict: FSP Dagger Pro 850W SFX Power Supply packs modern ATX 3.1 compliance and high output into a dense SFX enclosure. It provides clean 80 PLUS Gold power and modular routing tailored for space-constrained cases.
Specifications side by side
| Spec | Corsair RM850x 850W Fully Modular ATX 3.1 PSU | Corsair RM850x Shift 850W White ATX Power Supply | Thermaltake Toughpower Grand 850W Gold PSU | EVGA SuperNOVA 850W Platinum Power Supply | EVGA SuperNOVA 850 G+ 850W PSU | EVGA SuperNOVA 850 GM SFX Power Supply | EVGA 850 G6 Fully Modular PSU | EVGA SuperNOVA 850 G7 Gold Modular PSU | MSI MPG 850W Gold ATX 3.1 Power Supply | Thermaltake Toughpower GF3 850W ATX 3.1 PSU | SilverStone Extreme 850W Platinum SFX PSU | be quiet! Dark Power 13 850W Titanium PSU | ASUS TUF Gaming 850W Gold Power Supply | Thermaltake Toughpower GF A3 850W Gold PSU | FSP Dagger Pro 850W SFX Power Supply |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wattage | 850W | 850W | 850W | 850W | 850W | 850W | 850W | 850W | 850W | 850W | 850W | 850W | 850W | 850W | 850W |
| Efficiency Rating | Cybenetics Gold | 80 Plus Gold | 80 PLUS Gold | 80 PLUS Platinum | 80 Plus Gold | 80 PLUS Gold | 80 Plus Gold | 80 Plus Gold | 80+ Gold | 80 Plus Gold | Cybenetics Platinum | 80 PLUS Titanium | 80 Plus Gold | 80 Plus Gold | 80 PLUS Gold |
| Modularity | Fully Modular | Fully Modular | Fully Modular | Fully Modular | Fully Modular | Fully Modular | Fully Modular | Fully Modular | Fully Modular | Full Modular | modular | not specified | not specified | Fully Modular | Fully Modular |
| ATX Version | ATX 3.1 | ATX 3.1 | ATX 12V 2.3 | not specified | not specified | not specified | not specified | not specified | ATX 3.1 | ATX 3.1 | ATX 3.0 | ATX 3.0 | ATX 3.1 | ATX 3.1 | ATX 3.1 |
| PCIe Connector Type | 12V-2x6 | PCIe 5.1 | not specified | not specified | not specified | not specified | not specified | not specified | 12V-2x6 | 12V-2x6 | 12VHPWR | 12VHPWR, 6+2-pin | 16-pin PCIe | 12V-2x6 | 12V-2x6 |
| Fan Size | not specified | not specified | 14cm | 140mm | 135mm | not specified | not specified | not specified | not specified | 135mm | 92mm | not specified | not specified | not specified | 92mm |
| Warranty | not specified | not specified | not specified | 10 Year | 10 Year | 10 Year | 10 Year | 10 Year | 10 Year | not specified | not specified | not specified | not specified | 10 years | not specified |
| Form Factor | ATX | ATX | ATX | not specified | not specified | SFX | not specified | not specified | ATX | ATX | ATX | ATX | not specified | ATX | ATX |
| PCIe Version | PCIe 5.1 | PCIe 5.1 | not specified | not specified | not specified | not specified | not specified | not specified | PCIe 5.1 | PCIe 5.1 | not specified | not specified | not specified | not specified | PCIe 5.1 |
| Recommended Use | not specified | not specified | not specified | not specified | not specified | not specified | not specified | not specified | Gaming | not specified | not specified | not specified | Gaming | not specified | not specified |
| Connector | 12V-2x6 Connector | not specified | not specified | not specified | not specified | not specified | not specified | not specified | 12V-2x6 Connector | 12V-2x6 Connector | not specified | not specified | not specified | 12V-2x6 Connector | not specified |
| Size | 850W | 850W | 850W | 850W | 850W | 850W | 850W | 850W | 850W | 850W | 850W | 850W | 850W | 850W | 850W |
| Dimensions | 2.3 × 3.39 × 5.91 inches | 6.3 × 5.91 × 3.39 inches | 13.3 × 8.27 × 6.18 inches | 6.5 × 5.91 × 3.3 inches | 7.1 × 5.9 × 3.35 inches | 4.92 × 4.92 × 2.48 inches | 5.5 × 5.91 × 3.4 inches | 5.1 × 5.9 × 3.4 inches | 5.91 × 5.91 × 3.39 inches | 6.3 × 5.9 × 3.4 inches | 4.92 × 3.94 × 2.5 inches | 6.89 × 5.91 × 3.39 inches | 5.9 × 5.9 × 3.4 inches | 5.9 × 3.4 × 5.5 inches | 4.92 × 3.93 × 2.5 inches |
| Weight | 3.9 pounds | 3.75 pounds | 6 pounds | 7.95 pounds | 7 pounds | 4 pounds | 6.6 pounds | 1.87 pounds | 7.15 pounds | 3.73 pounds | not specified | not specified | 5.46 pounds | 3.42 pounds | 4.52 pounds |
| Color | Black | White | not specified | Black | gold | not specified | not specified | not specified | not specified | Black | not specified | not specified | TUF-GAMING-850G | Black | Black |
| Model | not specified | not specified | PS-TPG-0850MPCGUS-1 | 220-P2-0850-X1 | 120-GP-0850-X1 | 123-GM-0850-X1 | 220-G6-0850-X1 | 9B17-438-239 | MPG A850G PCIE 5 | PS-TPD-0850FNFAGU-4 | SST-EX850R-PM | BN660 | TUF-GAMING-850G | PS-TPD-0850FNFAGU-L | SDA2-850-G5 |
Is an 850W Power Supply Worth It?
An 850W capacity supports demanding hardware setups without exceeding safe operational limits. Units in this class deliver up to 600W dedicated through 12V-2x6 cables to handle current graphics cards and transient power spikes. This continuous output level accommodates mid-to-high-wattage systems, multi-rail configurations, and high ambient temperature environments. You can find this wattage in full-size ATX cases or dense SFX enclosures, offering balanced output for standard gaming desktop hardware.
Worth it if
- You run mid-to-high-wattage components or dedicated graphics hardware requiring up to 600W through a single cable.
- You need continuous 850W output across standard ATX or compact SFX system chassis.
Skip it if
- You build an entry-level desktop with low-draw parts that do not require 850W of total capacity.
- You run high-draw workstation components that exceed an 850W continuous power ceiling.
How We Picked 850W PSUs
To compile this guide of 15 power supplies, we identified units that list an 850W capacity in their title or feature list. We include only one variant per product family so you can compare distinct designs. All product details come directly from published manufacturer specifications without physical handling.
We list products in stock first, then by Amazon sales rank to display better-selling products first. To help you choose the right unit for your build, we compare published specifications across the lineup, including form factor, ATX version, PCIe compatibility, modular cabling, and efficiency ratings.
How to Choose an 850W Power Supply
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Check Form Factor Dimensions
Check your computer case specifications before selecting a power supply form factor. Standard ATX cases accommodate full-size ATX units, but compact mini-ITX cases require the smaller SFX standard. Measure your case compartment length carefully to avoid clearance issues with hard drive cages and modular cables. An SFX model like the EVGA SuperNOVA 850 GM provides full wattage in tight spaces where standard ATX power supplies physically cannot mount. Always confirm whether your chassis includes or requires an SFX-to-ATX bracket for proper installation.
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Compare Energy Efficiency Ratings
Evaluate the efficiency rating to determine how effectively the power supply converts AC wall power to DC system power. Most standard desktop builds target 80 Plus Gold, which minimizes thermal output and electrical waste during typical operation. If your system runs heavy computational workloads continuously, step up to Platinum or Titanium certifications. The be quiet! Dark Power 13 850W Titanium PSU delivers top-tier conversion efficiency, generating less waste heat inside your case. Review your expected system uptime to balance efficiency levels against your hardware requirements.
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Measure PSU Casing Depth
Examine the physical depth of the power supply casing relative to your chassis shroud. While standard ATX width and height remain fixed, length varies significantly between different product designs. A deeper unit leaves less clearance behind the power supply for storing excess cable length and routing stiff harnesses. For example, the EVGA SuperNOVA 850 G+ measures 7.1 inches deep, requiring an enclosure with sufficient open floor space under the shroud. Measure your clearance between the mounting bracket and drive cage prior to finalizing your selection.
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Inspect Modular Cable Connections
Select fully modular cabling to simplify system assembly and maximize internal airflow. Fully modular units let you plug in only the specific harnesses required for your motherboard, storage, and graphics cards. Eliminating unused cables leaves more open space behind motherboard trays and reduces air obstruction inside tight compartments. A design like the EVGA 850 G6 Fully Modular PSU enables you to detach unnecessary leads entirely, streamlining future component upgrades. Verify that the unit supplies sufficient dedicated CPU and PCIe ports to support your motherboard expansion needs.
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Verify Warranty Coverage Length
Review manufacturer warranty coverage as a direct indicator of long-term component reliability. Premium power supplies frequently offer warranties ranging up to ten years, demonstrating manufacturer confidence in internal component durability. Units backed by long coverage periods protect your system investment across multiple hardware upgrade cycles. The MSI MPG 850W Gold ATX 3.1 Power Supply includes a 10-year warranty alongside Japanese capacitors, assuring long-term support for your build. Always review the published warranty terms to confirm coverage specifics for your intended operating environment.
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Evaluate Internal Components and Cooling
Inspect the internal component specifications, focusing on capacitor origin and cooling fan engineering. Units equipped with Japanese capacitors withstand elevated operating temperatures and maintain consistent power delivery over prolonged use. Cooling hardware also impacts operational longevity, with fluid dynamic bearings or dual ball-bearing fans offering extended operational lifespans compared to basic sleeve bearings. The Thermaltake Toughpower Grand 850W Gold PSU utilizes Japanese capacitors and a 140mm ball-bearing fan to sustain high-temperature continuous output. Choosing durable internal components protects sensitive components against voltage instability under heavy system loads.
Frequently asked questions
What is the difference between 80 Plus Gold, Platinum, and Titanium 850W power supplies?
Efficiency ratings indicate how effectively an internal power supply converts AC electricity from the wall into DC power for your computer components. Higher ratings waste less energy as heat during standard desktop operation. On this list, models span 80 Plus Gold up to 80 Plus Platinum in the EVGA SuperNOVA 850 P2 and 80 Plus Titanium in the be quiet! Dark Power 13.
Can you install an SFX 850W power supply into a standard ATX computer case?
Yes, you can install an SFX unit into a standard ATX case if you use an appropriate mounting bracket adapter. Units such as the EVGA SuperNOVA 850 GM and SilverStone Extreme 850W measure under 5 inches in length and width. While designed primarily for compact enclosures, these small-form-factor units can fit full-size cases when you secure them with an adapter plate.
What are the advantages of a fully modular 850W power supply?
A fully modular power supply allows you to connect only the specific cables your setup requires. This design simplifies cable management and frees up space inside your chassis. Models such as the Corsair RM850x and EVGA 850 G6 let you detach unused peripheral and PCIe power leads completely, which helps maintain clean internal airflow and makes replacing or rerouting individual system cables much easier.
What cooling fan types and bearings are found in 850W power supplies?
Power supplies in this wattage class feature varied cooling configurations to maintain operational stability. For instance, the Thermaltake Toughpower Grand 850W uses a 140mm ball-bearing fan designed for continuous high temperatures. The EVGA SuperNOVA 850 G+ integrates a 135mm fluid dynamic bearing fan, while the ASUS TUF Gaming 850W utilizes dual ball bearings alongside a coated PCB for resilient operation.
Do 850W power supplies use single or multiple 12V rails?
Most modern desktop power supplies distribute 12V power across a single high-amperage rail, but select high-efficiency models utilize dedicated multi-rail layouts. For example, the be quiet! Dark Power 13 850W Titanium PSU distributes power across four dedicated 12V rails. Other units, like the EVGA SuperNOVA 850 G7, rely on tight DC-DC regulation over a single main rail to deliver steady voltage to your connected components.
How much does physical length vary among ATX 850W power supplies?
Physical length varies considerably across ATX models even when they share identical wattage ratings. In this 15-unit selection, compact models like the EVGA SuperNOVA 850 G7 measure 5.1 inches long, and the EVGA 850 G6 measures 5.5 inches. Longer designs require substantially more space, such as the EVGA SuperNOVA 850 G+ at 7.1 inches and the be quiet! Dark Power 13 at 6.89 inches.