Apevia Flex ATX 400W Fully Alternatives: 6 Similar Picks Compared
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If you are shopping for apevia itx pfc400w fully modular itx alternatives, you have several distinct hardware configurations to consider. The original Apevia ITX-PFC400W delivers 400W of power within a compact Flex ATX footprint measuring 6.3 by 2.9 by 1.4 inches. It features full modularity, Active PFC support from 90V to 264V, and forced ventilation through a 40mm double ball bearing fan. This unit also provides circuit defenses, including OVP, OLP, OCP, OTP, and SCP protections, alongside a single 6+2-pin PCIe connector.
You might prefer an alternative if your system needs higher wattage, dual PCIe connectors, or standard ATX dimensions. Builds with larger components often benefit from outputs ranging between 500W and 1200W, official 80 Plus efficiency ratings, or different brands like Rosewill and Thermaltake. These 6 alternatives were chosen because their specifications overlap directly with the original model in form factor, modular cabling, or active power delivery. This allows you to match your specific chassis clearance with appropriate power capacity.
Our top pick: Apevia Flex ATX 400W Fully Modular PSU.
Comparing the Apevia 400W Alternatives
Apevia Mini-ITX 500W Fully Modular Power Supply
The Apevia ITX-PFC500W shares the exact same 6.3 by 2.9 by 1.4-inch dimensions as the original 400W model. It matches the original fully modular layout and Active PFC design, but it raises maximum power output to 500W. While the original unit provides a single 6+2 PCIe connection, this 500W model features dual PCIe connectors to support graphics cards requiring twin power plugs. You give up no physical clearance inside tight Mini-ITX or Flex ATX cases. Choose this unit over the original if your compact build demands 100 additional watts of headroom and dual dedicated PCIe feeds without altering mounting dimensions.
Apevia Soul 650W Fully Modular PSU
The Apevia Soul 650W shifts from a compact Flex ATX design to a standard ATX desktop footprint. It measures 6.2 by 5.9 by 3.4 inches and weighs 4.4 pounds, offering 650W compared to the 400W limit of the base model. Like the original, it provides fully modular cable routing and Active PFC. However, you give up the ultra-thin 1.4-inch profile, so it will not physically fit into dedicated Flex ATX or slim Mini-ITX bays. Pick this power supply instead if your build uses a full-sized ATX enclosure and requires 250 extra watts for hardware with higher power demands.
Rosewill 500W Fully Modular Mini ITX PSU
The Rosewill VIT500 supplies 500W of fully modular power, providing 100W more output than the 400W Apevia. It incorporates dual PCIe connectors instead of the single connection on the original. It also includes a five-year warranty and explicit compatibility for NAS systems. At 6.5 by 3.15 by 1.57 inches and 1.43 pounds, it is slightly wider and taller than the Apevia model at 6.3 by 2.9 by 1.4 inches. You sacrifice a fraction of clearance in tight chassis enclosures. Select this model if you need dual GPU plugs, higher continuous power, and a long warranty for compact or storage-focused builds.
Thermaltake Smart 600W 80 Plus ATX PSU
The Thermaltake Smart 600W increases output to 600W and provides dual PCIe plugs, exceeding the 400W single-cable configuration of the Apevia. It features Active PFC in a standard desktop layout measuring 8.9 by 4 by 7 inches with a weight of 2.2 pounds. Unlike the original power supply, it does not feature a fully modular cable design, meaning all leads remain permanently attached. You also sacrifice the small Flex ATX format, preventing installation in compact Mini-ITX cases. You should choose this alternative if you are assembling a standard desktop tower and prioritize 600W capacity over modularity and compact dimensions.
Apevia Mystic 1200W Platinum Modular PSU
The Apevia Mystic provides 1200W of power, an 80 Plus Platinum efficiency rating, and ATX 3.0 compliance. Compared to the 400W base model, it delivers three times the wattage while retaining fully modular cables and Active PFC. It is engineered for heavy gaming hardware requiring PCIe 5.0 delivery. However, it gives up the compact Flex ATX form factor entirely. At 11 by 7.5 by 4.5 inches, it requires a full-sized ATX bay and cannot install into compact Mini-ITX cases. Choose this unit if you are upgrading to an expansive desktop case and need 1200W output with high electrical efficiency.
Apevia Galaxy 1200W Gold ATX 3.0 Power Supply
The Apevia Galaxy delivers 1200W of power with an 80 Plus Gold rating and ATX 3.0 architecture. Like the original 400W unit, it includes fully modular cabling and Active PFC. The key upgrades are 800 additional watts and modern PCIe 5.0 connectivity designed for high-demand hardware. What you surrender is the space-saving Flex ATX size. With measurements of 11 by 7.5 by 4.5 inches, this unit demands a large desktop case and will not fit inside small Mini-ITX chassis. Select this power supply if your build is based in a full-sized ATX tower and requires 1200W along with modern PCIe 5.0 connections.
Quick picks
Our 7 picks
Apevia Flex ATX 400W Fully Modular PSU
Best for: compact Mini-ITX builds needing modular cabling
- Wattage
- 400W
- Modularity
- Fully Modular
- PCIe Connector Type
- 6+2 PCIE
- Fan Size
- 40mm
- Power Factor Correction
- Active PFC
- Dimensions
- 6.3 × 2.9 × 1.4 inches
View on Amazon: Apevia Flex ATX 400W Fully Modular PSU Affiliate link
This Apevia unit is a 400-watt Flex ATX and Mini-ITX power supply built for compact PC builds. It features a fully modular cable design, active PFC handling 90 to 264 volts, and forced air ventilation via a 40-millimeter double ball bearing fan. You get a single 6+2 pin PCIe connector and two SATA ports, making it suitable for low-profile, small-form-factor systems needing clean cable management.
Pros
- Fully modular cable configuration
- Active PFC supporting 90V to 264V input
- Compact dimensions of 6.3 by 2.9 by 1.4 inches
- Includes OVP, OLP, OCP, OTP, and SCP protections
Cons
- Only one 6+2 pin PCIe connector
- Uses a small 40mm cooling fan
- Limited to two SATA power connectors
Good fit if
- You need a fully modular power supply for a Mini-ITX or Flex ATX chassis.
- You run a low-power build that stays within a 400-watt ceiling.
- You require detachable cables to preserve space in tight enclosures.
Skip if
- You need multiple PCIe power cables for high-draw graphics cards.
- You require more than 400 watts of total system power.
Verdict: Apevia Flex ATX 400W Fully Modular PSU delivers compact, modular power distribution with broad safety protections for small-form-factor enclosures. Its 400W ceiling and single PCIe cable make it an efficient fit for modest setups rather than power-heavy rigs.
Apevia Mini-ITX 500W Fully Modular Power Supply
Best for: compact Mini-ITX builds needing modular cabling
- Wattage
- 500W
- Modularity
- Fully Modular
- PCIe Connector Type
- 6+2 PCIE
- Fan Size
- 40mm
- Power Factor Correction
- Active PFC
- Dimensions
- 6.3 × 2.9 × 1.4 inches
View on Amazon: Apevia Mini-ITX 500W Fully Modular Power Supply Affiliate link
The Apevia 500W Fully Modular Flex ATX PSU gives you 500W of continuous power in a compact 1.4-inch tall Mini-ITX footprint. Its fully modular design lets you attach only the cables your setup requires, saving critical space. You get a single +12V rail supplying 33A, two 6+2-pin PCIe connectors, and active PFC protection. It suits you if you need compact Flex ATX power.
Pros
- Fully modular cable configuration
- Delivers 33A on the +12V rail
- Dual 6+2-pin PCIe connectors
- Full range Active PFC from 90V to 264V
- Built-in OVP, OLP, OCP, OTP, and SCP protections
Cons
- Provides only two SATA connectors
- Small 40mm fan for cooling
- No 80 PLUS efficiency certification listed
Good fit if
- You build inside a compact case requiring a Flex ATX or Mini-ITX power supply.
- You run a discrete graphics card requiring up to two 6+2-pin PCIe cables.
- You want fully modular cables to reduce clutter in small enclosures.
Skip if
- You need more than two SATA storage drives or accessories.
- You require a full-sized standard ATX power supply.
Verdict: Apevia 500W Fully Modular Flex ATX PSU packs 500W and dual PCIe connectors into a compact 1.4-inch tall profile. It gives small-form-factor builds full modularity and essential hardware protections.
Apevia Soul 650W Fully Modular PSU
Best for: ATX chassis builds needing 650W modular power
- Wattage
- 650W
- Modularity
- Fully Modular
- PCIe Connector Type
- 6+2Pin
- Fan Size
- 140mm
- Form Factor
- ATX
- Recommended Use
- Gaming
View on Amazon: Apevia Soul 650W Fully Modular PSU Affiliate link
If you are moving away from compact Flex ATX builds to a standard case, the Apevia Soul 650W Fully Modular ATX Power Supply offers a higher-capacity alternative. It delivers 650W of power with DC-to-DC topology, Active PFC, and a 140mm thermally controlled fan. The fully modular flat cables let you connect only required lines. This unit suits you if your chassis accepts full ATX power supplies and needs extra power for graphics cards.
Pros
- Fully modular flat black cables for tidy builds
- Thermally controlled 140mm fan balances noise and cooling
- DC-to-DC converter design with synchronous rectification
- Built-in protections against over-voltage, short-circuit, over-power, and under-voltage
Cons
- Full ATX casing does not fit compact Flex ATX or 1U chassis
- No 80 Plus efficiency certification listed in specifications
Good fit if
- You have a standard ATX case that accommodates a 158mm long power supply.
- You want fully modular cables to simplify cable routing.
Skip if
- You need a small Flex ATX or Mini-ITX form factor supply.
- You require an official 80 Plus efficiency certification.
Verdict: Apevia Soul 650W Fully Modular ATX Power Supply provides 650W output and modular cabling for standard desktop enclosures. It is a capable upgrade when your build is not constrained to small Flex ATX bays.
Rosewill 500W Fully Modular Mini ITX PSU
Best for: compact Mini ITX and NAS system builds
- Wattage
- 500W
- Modularity
- Fully Modular
- PCIe Connector Type
- 6+2 pin
- Fan Size
- 40mm
- Warranty
- 5-year
- Form Factor
- Mini ITX
View on Amazon: Rosewill 500W Fully Modular Mini ITX PSU Affiliate link
The Rosewill Mini ITX 500W Fully Modular Power Supply gives you 500 watts of output in a compact Flex ATX and Mini ITX form factor. It features full modularity, Active PFC handling 90 to 264 volts, and two 6+2-pin PCIe connectors. Built-in OVP, OPP, OCP, and SCP protect your hardware. This unit suits you if you need compact power for small Mini ITX cases or dedicated NAS enclosures requiring flexible cable management.
Pros
- Fully modular cable design
- 500W output with Active PFC 90-264V support
- Includes two 6+2-pin PCIe connectors
- Five-year warranty coverage
Cons
- Small 40mm cooling fan
- Limited to two SATA power connectors
Good fit if
- You build inside a Mini ITX, Flex ATX, or 1U case.
- You need two 6+2-pin PCIe connectors in a compact unit.
- You want fully modular cables to minimize clutter in small builds.
Skip if
- You need more than two SATA storage drives connected.
- You require more than 500W of total output.
Verdict: Rosewill Mini ITX 500W Fully Modular Power Supply delivers 500 watts of modular power with dual PCIe connectors in a compact Flex ATX footprint. It provides essential protection circuitry and a five-year warranty for compact desktop or NAS builds.
Thermaltake Smart 600W 80 Plus ATX PSU
Best for: standard ATX builds needing 600 watts
- Wattage
- 600W
- Efficiency Rating
- 80 PLUS Certified
- PCIe Connector Type
- 6 plus 2pin
- Warranty
- 5 Year
- Form Factor
- ATX
- Power Factor Correction
- Active PFC
View on Amazon: Thermaltake Smart 600W 80 Plus ATX PSU Affiliate link
This is a standard ATX power supply delivering 600 watts of continuous power at 40°C. If your case accommodates an ATX chassis rather than Flex ATX or Mini-ITX, it gives you two 6+2-pin PCIe connectors and basic 80 PLUS efficiency. It suits you if you need a higher 600-watt ceiling with a five-year warranty for a standard desktop case instead of an ultra-compact build.
Pros
- Delivers 600W continuous output at 40°C
- Provides two 6+2-pin PCIe connectors
- Backed by a 5-year warranty
- Features OPP, OVP, and SCP circuit protections
Cons
- ATX form factor does not fit Flex ATX or Mini-ITX cases
- Base 80 PLUS efficiency rating instead of higher tiers
Good fit if
- You have a standard ATX chassis that accommodates full-size power supplies.
- You need 600 watts of continuous output with two 6+2-pin PCIe connectors.
- You prioritize a 5-year warranty period.
Skip if
- You require a compact Flex ATX or 1U unit for a small-form-factor case.
- You need 80 PLUS Gold or higher power efficiency.
Verdict: Thermaltake Smart 600W ATX Power Supply delivers 600 watts of continuous output and dual PCIe plugs for standard chassis. It serves as a higher-wattage alternative if you are not restricted to Flex ATX dimensions.
Apevia Mystic 1200W Platinum Modular PSU
Best for: high-power systems needing 80 Plus Platinum efficiency
- Wattage
- 1200W
- Efficiency Rating
- 80+ Platinum Certified
- Modularity
- Fully Modular
- ATX Version
- ATX 3.0
- PCIe Connector Type
- 12VHPWR, 6+2 pin
- Fan Size
- 135mm
View on Amazon: Apevia Mystic 1200W Platinum Modular PSU Affiliate link
The Apevia Mystic 1200W Platinum ATX Power Supply delivers high-capacity power for systems that have outgrown small form factor boundaries. It features 80 Plus Platinum efficiency, full modularity, and compliance with the ATX 3.0 standard. You get a dedicated 16-pin PCIe 5.0 12VHPWR connector alongside Japanese capacitors and a 135mm RGB cooling fan. It suits you if you are migrating from a compact build to a full-sized ATX tower requiring substantial power headroom.
Pros
- 80 Plus Platinum certified efficiency
- ATX 3.0 compliant with a 16-pin 12VHPWR PCIe 5.0 connector
- Fully modular cable configuration
- 100% Japanese electrolytic capacitors
- 135mm thermally controlled RGB fan
Cons
- Standard ATX form factor does not fit Flex ATX or 1U cases
- Output capacity far exceeds standard low-power ITX requirements
Good fit if
- You are moving your setup into a full ATX chassis that accommodates standard power supplies.
- You need a dedicated 16-pin 12VHPWR connector for a PCIe 5.0 graphics card.
- You require 80 Plus Platinum efficiency with 1200W of total capacity.
Skip if
- You need a compact power supply to fit a Flex ATX or Mini-ITX enclosure.
- Your build only requires 400W to 500W of total power.
Verdict: Apevia Mystic 1200W Platinum ATX Power Supply provides high-wattage capacity and ATX 3.0 support for builders moving beyond low-wattage enclosures. Its large ATX footprint means it cannot replace a Flex ATX unit in compact ITX cases.
Apevia Galaxy 1200W Gold ATX 3.0 Power Supply
Best for: high-wattage ATX gaming builds needing PCIe 5.0
- Wattage
- 1200W
- Efficiency Rating
- 80+ Gold Certified
- Modularity
- Fully Modular
- ATX Version
- ATX 3.0
- PCIe Connector Type
- 12VHPWR, 6+2 pin
- Fan Size
- 135mm
View on Amazon: Apevia Galaxy 1200W Gold ATX 3.0 Power Supply Affiliate link
The Apevia Galaxy 1200W provides a standard ATX alternative if your build allows a larger enclosure. Delivering 1200W of power with an 80 Plus Gold efficiency certification, it features a fully modular cable design, a 135mm cooling fan, and ATX 3.0 compliance with a dedicated 12VHPWR connector. This unit suits you if you are stepping up from low-wattage small-form-factor builds to high-draw hardware requiring standard ATX mounting.
Pros
- 80 Plus Gold certified efficiency
- 1200W output with ATX 3.0 compliance and PCIe 5.0 12VHPWR cable
- Fully modular cable configuration
- 135mm thermally controlled FDM bearing fan
- 100% Japanese electrolytic capacitors
Cons
- Standard ATX dimensions do not fit Mini-ITX or Flex ATX enclosures
- Over-temperature protection is not listed in the specifications
Good fit if
- You need 1200W of power for high-demand components.
- You require a native 12VHPWR connector for PCIe 5.0 hardware.
- You have a PC chassis that accommodates full-size ATX power supplies.
Skip if
- You need a compact Flex ATX or 1U power supply.
- You run a low-wattage build that does not need 1200W capacity.
Verdict: Apevia Galaxy 1200W 80 Plus Gold ATX Power Supply delivers high-capacity power and modern PCIe 5.0 connectivity for full-sized desktop cases. It trades compact form-factor compatibility for high wattage and fully modular cabling.
Specifications side by side
| Spec | Apevia Flex ATX 400W Fully Modular PSU | Apevia Mini-ITX 500W Fully Modular Power Supply | Apevia Soul 650W Fully Modular PSU | Rosewill 500W Fully Modular Mini ITX PSU | Thermaltake Smart 600W 80 Plus ATX PSU | Apevia Mystic 1200W Platinum Modular PSU | Apevia Galaxy 1200W Gold ATX 3.0 Power Supply |
|---|---|---|---|---|---|---|---|
| Wattage | 400W | 500W | 650W | 500W | 600W | 1200W | 1200W |
| Efficiency Rating | not stated | not stated | not stated | not stated | 80 PLUS Certified | 80+ Platinum Certified | 80+ Gold Certified |
| Modularity | Fully Modular | Fully Modular | Fully Modular | Fully Modular | not stated | Fully Modular | Fully Modular |
| ATX Version | not stated | not stated | not stated | not stated | not stated | ATX 3.0 | ATX 3.0 |
| PCIe Connector Type | 6+2 PCIE | 6+2 PCIE | 6+2Pin | 6+2 pin | 6 plus 2pin | 12VHPWR, 6+2 pin | 12VHPWR, 6+2 pin |
| Fan Size | 40mm | 40mm | 140mm | 40mm | not stated | 135mm | 135mm |
| Warranty | not stated | not stated | not stated | 5-year | 5 Year | not stated | not stated |
| Form Factor | not stated | not stated | ATX | Mini ITX | ATX | ATX | ATX |
| Recommended Use | not stated | not stated | Gaming | not stated | not stated | Gaming | Gaming |
| Power Factor Correction | Active PFC | Active PFC | Active PFC | Active PFC | Active PFC | Active PFC | Active PFC |
| Size | not stated | not stated | 650W | Mini ITX/Flex ATX | 600W | 1200W ATX 3.0 & PCIe 5.0 Fully Modular Platinum | 1200W PCIe 5.0 |
| Device Compatibility | not stated | not stated | not stated | NAS | not stated | not stated | not stated |
| Dimensions | 6.3 × 2.9 × 1.4 inches | 6.3 × 2.9 × 1.4 inches | 6.2 × 5.9 × 3.4 inches | 6.5 × 3.15 × 1.57 inches | 8.9 × 4 × 7 inches | 11 × 7.5 × 4.5 inches | 11 × 7.5 × 4.5 inches |
| Weight | not stated | not stated | 4.4 pounds | 1.43 pounds | 4.5 pounds | not stated | not stated |
| Model | ITX-PFC400W | ITX-PFC500W | ATX-SL650W | VIT500 | PS-SPD-0600NPCWUS-W | ATX-MT1200W ATX3.0 PCIE5 | ATX-GX1200W ATX3.0 PCIE5 |
| Color | not stated | not stated | Black | Black | Black | not stated | not stated |
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Frequently asked questions
Which alternative is suitable for a NAS build?
The Rosewill 500W Fully Modular Mini ITX PSU (model VIT500) is designated for NAS system builds. It measures 3.15 inches wide, 1.57 inches high, and 6.5 inches long, offering a compact Flex ATX profile. The unit provides 500 watts of fully modular power, Active PFC, and dual PCIe connectors, giving you reliable hardware delivery for tight network storage enclosures.
Can you replace an Apevia Flex ATX power supply with a standard ATX unit?
You cannot install a standard ATX power supply inside a dedicated Flex ATX case slot. Standard units like the Apevia Soul 650W measure 5.9 by 3.4 by 6.2 inches, which exceeds the 1.4-inch height of Flex ATX bays. You should only select an ATX alternative if you migrate your components into a larger desktop chassis designed for standard power supply form factors.
Which alternative power supplies support PCIe 5.0?
Both the Apevia Mystic 1200W Platinum and Apevia Galaxy 1200W Gold feature PCIe 5.0 connectivity and ATX 3.0 compliance. These high-output units are fully modular and utilize Active PFC. Because they use full-sized ATX dimensions measuring 7.5 by 4.5 by 11 inches, you can only run them in standard desktop computer cases rather than compact Mini-ITX or Flex ATX enclosures.
Which alternatives include dual PCIe connectors for graphics cards?
The Apevia ITX-PFC500W, Rosewill VIT500, and Thermaltake Smart 600W all supply dual PCIe connectors. In contrast, the baseline Apevia Flex ATX 400W model includes only a single PCIe cable. If your graphics card requires two PCIe power plugs, choosing a 500W Flex ATX model or a larger ATX unit ensures you have the necessary dedicated power lines available.
How do the dimensions of the Rosewill 500W compare to the Apevia Flex ATX units?
The Rosewill VIT500 is slightly larger than the Apevia Flex ATX power supplies. It measures 3.15 inches wide, 1.57 inches high, and 6.5 inches long, weighing 1.43 pounds. The Apevia ITX-PFC400W and ITX-PFC500W measure 2.9 inches wide, 1.4 inches high, and 6.3 inches long. You should measure your chassis clearance to verify the Rosewill unit fits.
What is the highest efficiency rating among these alternative options?
The highest efficiency rating listed is 80 Plus Platinum, found on the Apevia Mystic 1200W ATX power supply. The Apevia Galaxy 1200W provides an 80 Plus Gold rating. Both models feature fully modular cables and Active PFC. However, their 11-inch length requires a full-size desktop case, meaning you cannot install them into compact Flex ATX enclosures.
Are all of these alternative power supplies fully modular?
Not all alternatives feature fully modular cables. The Thermaltake Smart 600W ATX power supply does not offer modularity, meaning all power cables remain permanently attached to the chassis. In contrast, the Apevia ITX-PFC500W, Rosewill VIT500, Apevia Soul 650W, Apevia Mystic 1200W, and Apevia Galaxy 1200W all provide fully modular cable management, letting you detach unused cords to save interior space.