Small form factor builds demand more planning than a typical desktop. In a compact Mini-ITX case, the power supply has to fit the enclosure, leave room for cable routing, and provide enough capacity for the components without turning the system into a hot, cluttered project. An SFX unit is often the right answer, but choosing one is not as simple as buying the highest wattage available.
This guide to the best sfx power supply for small form factor builds focuses on the real tradeoffs: budget versus efficiency, modest gaming systems versus high-draw hardware, and simple fixed-cable setups versus fully modular cable management. For 2026, these eight options cover everything from affordable 400W replacements to premium 1000W SFX power supplies for ambitious compact PCs.
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Our Top Picks
Top 3 picks at a glance
Quick Picks
| Product | Best for | Price |
|---|---|---|
| LIAN LI SP750 V2 750W SFX Power Supply | Balanced 750W SFF builds | Check on Amazon |
| APEVIA SFX-AP400W 400W Power Supply | Basic compact PCs on a strict budget | Check on Amazon |
| APEVIA PS-SFX500W 500W Power Supply | Affordable entry-level gaming builds | Check on Amazon |
| FSP SFX Pro 450W Power Supply | Efficiency-minded moderate-power systems | Check on Amazon |
| Apevia SFX-AP500W 500W Power Supply | Low-cost Mini-ITX or Micro ATX replacements | Check on Amazon |
| CORSAIR SF750 Fully Modular Low Noise Power Supply | Premium cable management in a 750W build | Check on Amazon |
| Cooler Master V750 SFX Gold ITX SFF Power Supply | PCIe 5.1-ready compact gaming PCs | Check on Amazon |
| LIAN LI SP1000P 1000W SFX Power Supply | High-wattage enthusiast SFF systems | Check on Amazon |
How We Compared
We prioritized products specifically positioned for SFX, Mini-ITX, Micro ATX, or small-form-factor use, then compared their available wattage, stated efficiency certification, feature set, and price. The goal was not to treat every builder alike. A 400W supply can make sense for a straightforward office PC, while a 1000W model is more appropriate for a compact system built around power-hungry components.
Value mattered as much as raw capacity. We also gave extra weight to meaningful small-build conveniences, including fully modular cabling, low-noise positioning, higher efficiency ratings, and PCIe 5.1 readiness where stated. Before buying, always confirm the PSU clearance and connector requirements listed by your specific case and components.
The 8 Best Picks
1. LIAN LI SP750 V2 750W SFX Power Supply
The LIAN LI SP750 V2 is the most balanced choice here for builders who want substantial headroom without stepping into the price territory of premium 750W and 1000W alternatives. Its 80 Plus Gold certification also makes it a sensible option for shoppers who want a higher-efficiency designation in an SFX format. It is particularly appealing when you want one power supply to support a compact build through future component changes.
- Pro: 750W capacity offers meaningful flexibility for a small form factor build.
- Pro: 80 Plus Gold certification adds efficiency-focused appeal.
- Con: It costs more than the value-oriented 400W and 500W choices.
2. APEVIA SFX-AP400W 400W Power Supply
The APEVIA SFX-AP400W is the practical budget pick for a compact PC that does not need oversized power capacity. That makes it a useful option for basic home-office desktops, media PCs, replacement projects, or modest systems where keeping the total build cost controlled matters more than premium efficiency branding. Its 400W rating calls for sensible component planning, but that is often enough for uncomplicated builds.
- Pro: It is marketed for Mini-ITX, Micro ATX, and SFX use.
- Con: 400W provides less upgrade headroom than the 500W, 750W, and 1000W options.
Skip it for a performance gaming PC or any build expected to need significant power headroom later.
3. APEVIA PS-SFX500W 500W Power Supply
The APEVIA PS-SFX500W is a straightforward step up from a 400W unit without a major jump in price. The appeal is simple: it keeps spending low while offering additional capacity for builders who do not want to box themselves into the most basic power tier. It is especially worth considering when every dollar of a compact build is being allocated carefully.
- Pro: 500W provides more flexibility than a 400W power supply.
- Con: It does not carry a stated 80 Plus efficiency certification in the provided specifications.
Skip it if you are building around higher-power components and would be more comfortable with 750W or 1000W capacity.
4. FSP SFX Pro 450W Power Supply
The FSP SFX Pro 450W fits the buyer who prefers a middle-ground power rating with a stated efficiency certification. Its 450W capacity is aimed at moderate-power small PCs, while the 80 Plus Bronze certification distinguishes it from the lowest-cost options that do not list a certification. It is a measured choice for a compact desktop with restrained component demands.
- Pro: 80 Plus Bronze certification is a clear efficiency-oriented feature.
- Pro: 450W can suit moderate-power compact desktops.
Skip it if your main priority is getting the most wattage possible for the lowest purchase price.
5. Apevia SFX-AP500W 500W Power Supply
The Apevia SFX-AP500W is another affordable 500W route for builders working with Mini-ITX, Micro ATX, or SFX-compatible systems. It is best approached as a practical component for shoppers who already know their system’s needs are moderate and who do not need premium efficiency certification or advanced feature callouts.
- Pro: 500W is a versatile capacity level for many modest small builds.
- Con: There is no stated 80 Plus certification among the published listing information.
Skip it if you need a fully modular design, PCIe 5.1 readiness, or a higher-efficiency model with a stated Gold or Platinum rating.
6. CORSAIR SF750 Fully Modular Low Noise Power Supply
The CORSAIR SF750 is for builders willing to pay more for a premium-oriented 750W SFX solution with fully modular cabling and a low-noise focus. The 750W rating also gives it a broader role than basic replacement units, making it appropriate for enthusiast-level compact desktops that need more than entry-level capacity. It is a strong fit when cable management is a central part of the build plan.
- Pro: Fully modular cabling can simplify a tight small-form-factor build.
- Pro: 750W supports more ambitious compact configurations.
Skip it if you are building a basic PC and do not need modular cabling or 750W of capacity.
7. Cooler Master V750 SFX Gold ITX SFF Power Supply
The Cooler Master V750 SFX Gold is aimed at modern compact gaming and enthusiast systems where PCIe 5.1 readiness is a priority. Its 750W rating, 80 Plus Gold certification, and ITX/SFF positioning make it one of the more feature-conscious choices in the roundup. If your goal is to assemble a tidy, current-generation SFF machine rather than simply replace a failed PSU, its stated features are compelling.
- Pro: PCIe 5.1 readiness supports a more current-focused build plan.
- Pro: 80 Plus Gold certification and 750W capacity suit enthusiast SFF use.
Skip it if PCIe 5.1 readiness is not relevant to your parts list and a lower-cost unit meets your wattage needs.
8. LIAN LI SP1000P 1000W SFX Power Supply
The LIAN LI SP1000P is the high-capacity choice for builders who need a serious power reserve in an SFX format. It is the most powerful model in this group and costs only slightly more than the premium 750W choices, which can make it attractive when wattage headroom is nonnegotiable. Still, 1000W is not automatically better for every build; the system should genuinely call for that level of capacity.
- Pro: 1000W is the highest capacity in this roundup.
- Pro: 80 Plus Platinum is the highest stated efficiency certification here.
- Con: It is unnecessary spending for many basic and midrange SFF PCs.
Skip it if your components are moderate-power and a 500W or 750W unit will provide the headroom you need.
Buying Guide
Start With a Realistic Wattage Target
Wattage should match the system you are actually building, not the most extreme hypothetical upgrade you might make years from now. A 400W or 450W unit can be appropriate for a restrained office, media, or basic home PC. A 500W supply offers a little more room for a modest gaming-oriented build. For performance-focused compact PCs, 750W is the more flexible category in this list. The 1000W LIAN LI SP1000P is best reserved for systems with especially demanding power requirements.
Choose Efficiency for Your Budget and Priorities
The stated certifications in this group range from 80 Plus Bronze to 80 Plus Gold and 80 Plus Platinum. The FSP SFX Pro is the Bronze-certified option, while the LIAN LI SP750 V2 and Cooler Master V750 SFX Gold carry Gold certification. The LIAN LI SP1000P carries Platinum certification. Certification is only one buying factor, but it is a useful comparison point when deciding whether a higher-priced power supply aligns with your goals.
Plan Around Your Case Before Ordering
An SFX label does not eliminate the need to check compatibility. Review your case documentation for supported PSU formats and clearance, then verify the cable and connector needs of your planned parts. This matters even more in compact cases, where cable routing can affect how easy the system is to assemble and maintain. Fully modular options such as the CORSAIR SF750 can be especially attractive for builders who want to avoid storing unused cables in a confined interior.
Our Verdict
For most shoppers seeking the best sfx power supply for small form factor builds, the LIAN LI SP750 V2 is the strongest all-around value. For high-end compact systems, the LIAN LI SP1000P stands out with 1000W and 80 Plus Platinum certification.
FAQ
Is 500W enough for a small form factor PC?
It can be, depending on the components. The two 500W Apevia options are positioned for small-form-factor builds and offer more capacity than the 400W model. Check the requirements of every component before selecting a PSU.
Should I buy a 750W SFX power supply instead of a 500W model?
Choose 750W when your build needs more headroom, when you expect to use higher-power hardware, or when you want more flexibility for future changes. The LIAN LI SP750 V2, CORSAIR SF750, and Cooler Master V750 SFX Gold are the 750W choices here.
What is the most affordable option in this roundup?
Which SFX PSU has the highest stated efficiency certification?
The LIAN LI SP1000P has an 80 Plus Platinum certification. The LIAN LI SP750 V2 and Cooler Master V750 SFX Gold are 80 Plus Gold models, while the FSP SFX Pro is 80 Plus Bronze certified.
