5 Best SFX PSUs (October 2026)

A small-form-factor build leaves less room to hide bulky wiring, and a power supply that fits the case can still make assembly awkward if its cables are too short. Capacity matters just as much: an 850W unit leaves more headroom for a demanding graphics card than a 750W model, but extra wattage does not fix coil whine, poor cable reach or an undersized case.

The Best SFX PSUs here include the Cooler Master V850 SFX White for high-draw builds, the Cooler Master V750 SFX White for compact systems that need 750W, and the Corsair SF850 (2024) for a quiet, efficient SFF setup. The Lian Li SP750 V2 prioritizes a long warranty and a native 12V-2×6 connection, while Thermaltake’s 850W model adds Platinum efficiency with a shorter warranty and a less reassuring durability picture.

Best SFX PSUs: top picks at a glance

• Best overall: the Cooler Master V850 SFX White, with 850W output, 80 PLUS Gold efficiency and a native 12V-2×6 cable for a compact high-power build.
• Best for quiet SFF builds: the Corsair SF850 (2024) pairs 850W output with 80 PLUS Platinum efficiency and a fan-stop mode.
• Best 750W option: the Lian Li SP750 V2, with a 92mm fan, native 12V-2×6 cable and 10-year warranty.
• Best for a white ITX build: the Cooler Master V750 SFX White offers 750W in a fully modular SFX package.

Best SFX PSUs Comparison (October 2026)

#	Product	Best for	Output	Efficiency	Warranty
1	Cooler Master V850 SFX White	High-draw ITX builds	850W	80 PLUS Gold	10 years
2	Cooler Master V750 SFX White	White 750W builds	750W	80 PLUS Gold	10 years
3	Corsair SF850 (2024)	Quiet SFF gaming PCs	850W	80 PLUS Platinum	7 years
4	Lian Li SP750 V2	Low-noise 750W builds	750W	80 PLUS Gold	10 years
5	Thermaltake Toughpower SFX 850W	Platinum 850W builds	850W	80 PLUS Platinum	7 years

1. Cooler Master V850 SFX White: Best 850W SFX PSU for high-draw ITX builds

• Output: 850W
• Efficiency: 80 PLUS Gold
• Form Factor: SFX
• Dimensions: 3.93 x 4.9 x 2.5 inches
• Warranty: 10 years

Pros:

• 850W output gives a compact system more headroom for a power-hungry graphics card.
• The native 12V-2×6 connection supports modern graphics cards, with a 600W-capable GPU cable.
• Fully modular cabling lets a builder connect only the leads the system needs.
• At about 4 pounds, it remains a relatively compact component for a high-output build.

Cons:

• Coil whine can be noticeable, making it a less predictable fit for a quiet room.
• Short, customized cables can be awkward in cases larger than a small ITX enclosure.
• 80 PLUS Gold efficiency trails the Platinum rating of the Corsair and Thermaltake options.

Best for: ITX builders pairing a high-draw graphics card with a white case and needing 850W in an SFX enclosure.

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At 850W, the Cooler Master V850 SFX White suits a compact system built around a demanding CPU and graphics card. Its SFX dimensions are just 3.93 x 4.9 x 2.5 inches, so it takes up little space inside a small chassis. The white finish also makes it a natural match for a lighter-colored build rather than a component that disappears into a dark case.

The native 12V-2×6 cable is a practical advantage for a modern graphics card. Cooler Master rates its GPU connection for up to 600W, while the ATX 3.1-ready design supports current-generation power requirements. That capacity is useful headroom, not a reason to ignore the case’s cable routing: the included leads are customized and can be short in a larger enclosure.

Compared with the Cooler Master V750 SFX White, this model adds 100W of output while keeping the same Gold efficiency and 10-year warranty. The higher capacity is the point if the build will run a powerful GPU; the 750W model makes more sense when the parts list does not need that extra margin. Both are fully modular, so unused leads do not have to occupy the already tight space around the PSU.

Noise is the main caveat. Its cooling setup uses a fan, but coil whine can make this unit a poor match for a silent desktop, and that electrical noise is distinct from ordinary fan airflow. The 4-pound body is compact once installed, but cable reach deserves a check against the chosen chassis before assembly.

2. Cooler Master V750 SFX White: Best 750W Gold power supply for white ITX builds

• Output: 750W
• Efficiency: 80 PLUS Gold
• Form Factor: SFX
• Dimensions: 3.94 x 4.92 x 2.5 inches
• Warranty: 10 years

Pros:

• 750W output suits many compact gaming builds without moving to a larger PSU format.
• A native 12V-2×6 cable supports current graphics cards, with up to 450W available to the GPU.
• Fully modular wiring makes it easier to leave unused cables out of a cramped case.
• The 9.2cm fan and 10-year manufacturer warranty support long-term use.

Cons:

• Short cables can make routing difficult, especially if the case is larger than a tight ITX layout.
• Gold efficiency is a step below the Platinum-rated 850W alternatives.
• 750W leaves less headroom than the V850 for later high-power component changes.

Best for: A white ITX system with a graphics card that fits within 750W and a chassis that works with short cables.

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The Cooler Master V750 SFX White gives up 100W compared with the V850, but keeps the same SFX footprint, Gold efficiency and 10-year manufacturer warranty. That makes it a sensible fit when the planned components need 750W rather than extra reserve. Its 3.94 x 4.92 x 2.5-inch body leaves more room for the rest of a compact build than an ATX power supply would.

The fully modular design keeps the cable bundle under control, an important benefit when there is little space between the PSU and the rest of the system. Its native 12V-2×6 connection supports a graphics card with up to 450W available on that lead. The 9.2cm fan handles cooling within the small enclosure, though this model does not have the higher output of its sibling.

Compared with the Cooler Master V850 SFX White, this is the more restrained choice for a build that will not use the additional 100W. Compared with the Lian Li SP750 V2, it offers a similar 750W capacity and Gold rating, but the Cooler Master’s standout distinction here is its white finish. It can tie the power supply visually into a white case rather than leaving a conspicuous black component inside.

Cable length is the practical drawback. The short leads are made for compact systems and may not reach cleanly in a roomier chassis, so this is not the one to choose simply because the power rating fits. The 10-year warranty and compact body are strong foundations, but routing needs to suit the case from the start.

3. Corsair SF850 (2024): Best Platinum SFX PSU for quiet small-form-factor PCs

• Output: 850W
• Efficiency: 80 PLUS Platinum
• Form Factor: SFX
• Dimensions: 4.92 x 3.94 x 2.5 inches
• Warranty: 7 years

Pros:

• 80 PLUS Platinum efficiency pairs with 850W output in a true SFX-size unit.
• Zero RPM mode lets the fan stop during light workloads.
• The 92mm fluid-dynamic-bearing fan is designed for low-noise cooling.
• Seven modular connector positions give the build room for a range of cable needs.

Cons:

• Short cables can limit placement in a mid-tower or a larger SFF case.
• The 7-year warranty is shorter than the 10 years offered by both Cooler Master models and the Lian Li.
• Power delivery and cable fit are not equally suited to every component layout.

Best for: A compact gaming PC that needs 850W, Platinum efficiency and low fan noise during everyday desktop use.

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The Corsair SF850 (2024) combines 850W output with 80 PLUS Platinum efficiency, making it the efficiency-focused alternative to the Gold-rated Cooler Master V850. It uses a 92mm PWM fan and includes Zero RPM mode, so the fan can stop at low load rather than adding steady airflow noise during light desktop tasks. At 2.3 pounds, it is also the lightest of these five models.

That combination suits a small system that spends much of its time browsing, working or idling, but also needs power for demanding gaming sessions. The 2024 model is SFX in form, and its fully modular design lets the builder connect only the required leads. A bracket is included for fitting the unit in a compatible ATX PSU position, giving the small PSU another possible home in a larger case.

Cable length is the primary fit issue. The short leads are useful in a tightly packed SFF layout, where extra slack is hard to manage, but they can fall short in a mid-tower. In one real-world configuration, the CPU power lead was stretched close to its limit. Measure the route from the PSU to the motherboard connection before assuming the compact cables will work in a larger chassis.

Against the Cooler Master V850 SFX White, Corsair trades a 10-year warranty for Platinum efficiency and fan-stop behavior. Its seven-year coverage is still substantial, but it is shorter, and power delivery does not feel equally suited to every configuration. For a second build around a compact chassis, including a Lian Li A4-style layout, the short cables can make cable management straightforward; for a roomy case, plan on cables with more reach.

4. Lian Li SP750 V2: Best 750W Gold SFX power supply for quiet builds

• Output: 750W
• Efficiency: 80 PLUS Gold
• Form Factor: SFX
• Dimensions: 4.92 x 3.94 x 2.5 inches
• Warranty: 10 years

Pros:

• The native 12V-2×6 connector supports a current graphics-card setup.
• A 92mm fluid-dynamic-bearing fan keeps cooling hardware within the compact SFX frame.
• The fan can remain off at lighter loads, limiting background noise.
• Fully modular cables and a 10-year warranty suit a carefully planned small build.

Cons:

• Only two PCIe cables are included, which can restrict connectivity plans.
• Power-hungry components can make the unit run hot.
• At about 3.9 pounds, it is heavier than the Corsair SF850.

Best for: A low-noise 750W SFF PC with a compatible graphics card and a build plan that needs no more than two PCIe cables.

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For a 750W build that prioritizes a quiet desktop, the Lian Li SP750 V2 combines a 92mm fluid-dynamic-bearing fan with a fan-stop behavior that can leave the fan idle at lighter loads. Its SFX body measures 4.92 x 3.94 x 2.5 inches, and the fully modular design helps limit unused wiring in a compact case. The 10-year warranty is the longest term among the three Gold-rated models here.

Its native 12V-2×6 connector is ready for a current graphics card, and the ATX 3.1 design includes upgraded standby power for peripherals. The fan does not need to spin continuously in a lightly loaded system, which can help keep a NAS or a tuned-down compact PC quiet. A small home-lab setup is one practical fit, especially when the build uses modest components and does not need a large number of GPU cables.

Cable count needs a close look before choosing it. Only two PCIe cables are included, which can constrain a system with more demanding connectivity needs. The unit can also run hot with power-hungry components, so the quiet operation that suits a restrained SFF system should not be mistaken for unlimited thermal headroom.

Compared with the Corsair SF850 (2024), the Lian Li provides 100W less output and Gold rather than Platinum efficiency, but extends warranty coverage by three years. Compared with the Cooler Master V750 SFX White, it offers the same 750W output and Gold rating, with the native connector and fan behavior as key differentiators. A compact NAS or low-power gaming system can make use of its restrained fan profile, provided two PCIe cables are enough.

5. Thermaltake Toughpower SFX 850W: Best Platinum power supply for compact high-output PCs

• Output: 850W
• Efficiency: 80 PLUS Platinum
• Form Factor: SFX
• Dimensions: 4.05 x 4.9 x 2.5 inches
• Warranty: 7 years

Pros:

• 850W output and 80 PLUS Platinum efficiency suit a powerful compact system.
• The native 12V-2×6 connector provides up to 450W for a compatible graphics card.
• Fully modular cabling makes it easier to control wiring in a small case.
• The 90mm fluid-dynamic-bearing fan is quiet under load in a suitable build.

Cons:

• Durability is the central concern, with some units failing within their first year.
• The 7-year warranty is shorter than the 10 years on several competing options.
• Stiff cables can make tight routing harder inside an SFX case.

Best for: A high-output compact PC that needs 850W and Platinum efficiency, with a builder willing to prioritize those features over a longer warranty.

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The Thermaltake Toughpower SFX 850W gives a compact PC 850W output and 80 PLUS Platinum efficiency, matching the Corsair’s headline capacity and efficiency class. Its native 12V-2×6 connector supplies up to 450W to a compatible graphics card, and the fully modular design keeps unused cables out of a cramped chassis. At 4.05 x 4.9 x 2.5 inches, it fits the SFX footprint.

Its 90mm fluid-dynamic-bearing fan can stay quiet even when the system is under load, and the modular cables simplify basic cable management. That is useful in a build with a powerful CPU and GPU, where a compact power supply still needs to serve a substantial load. The 7-year warranty provides a defined support period, though it falls short of the 10 years offered by the V850 and SP750 V2.

Durability is the reason this model sits behind the other 850W choices. Some units have stopped powering a system within months, including one after seven months of use, so longevity is less reassuring than its efficiency rating suggests. The cables are also stiff, which makes a narrow bend or tight route more work in a small case.

Compared with the Corsair SF850 (2024), Thermaltake also offers Platinum efficiency and 850W, but the Corsair has fan-stop mode and a lighter 2.3-pound body. Compared with the Cooler Master V850 SFX White, this model trades Gold for Platinum efficiency, while the Cooler Master has a longer warranty and a higher-powered GPU cable. The 450W connector rating and 7-year coverage are the practical numbers to weigh before choosing it.

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Buyer's Guide: How to Choose the Right SFX PSU

An SFX PSU has to fit the case while providing enough stable output for the CPU and graphics card, and those two demands can pull in opposite directions. Check wattage and cable reach together: a compact unit with plenty of output is no help if its leads cannot comfortably reach the required connections.

• Check the case’s PSU format: Confirm that the enclosure accepts SFX, and check whether an ATX mounting position needs a bracket.
• Match output to the build: Choose a capacity that covers the planned components and leaves sensible room for their combined demand.
• Confirm GPU power connections: Check the type and capacity of the GPU cable, not just the total wattage.
• Measure cable routes: Compare cable reach with the case layout, especially if the PSU sits far from the CPU power connection.
• Compare warranty and efficiency: Gold and Platinum ratings describe different efficiency levels; warranty terms vary from 7 to 10 years in this group.

Output Capacity and Upgrade Headroom

The wattage printed on a PSU is its output capacity, not a promise that a system needs to use it all. For this lineup, 750W models suit builds planned around that capacity, while an 850W unit leaves more headroom for higher-power components. The Cooler Master V750 SFX White and Lian Li SP750 V2 are the 750W choices; the Cooler Master V850 SFX White, Corsair SF850 (2024) and Thermaltake are 850W options.

Settle the graphics card and processor first, then choose the power supply around the system’s needs. The native GPU cable matters too: the V850 supports up to 600W on its GPU connection, while the V750 and Thermaltake connectors support up to 450W. Those figures describe the individual cable’s capacity, not the full output available to every part of the system.

SFX Dimensions and Case Fit

SFX describes a compact PSU form factor, but it does not guarantee that every cable will reach comfortably in every case. Compare the unit’s dimensions with the case’s clearance, then trace the route from the PSU to the CPU and graphics card connections. A small enclosure can make short leads helpful; a roomy chassis can turn the same leads into a constraint.

If the power supply will sit in an ATX position, look for mounting compatibility and any required bracket. The Corsair includes an SFX-to-ATX bracket, while the other models here are built around SFX use. Case layout also affects how much room remains for wiring; how much space a custom chassis leaves for cable routing can matter as much as the PSU’s outer dimensions.

Efficiency, Fan Noise and Cooling

80 PLUS Gold and Platinum are efficiency certifications, with Platinum indicating a higher efficiency class than Gold. In this group, the Corsair SF850 and Thermaltake Toughpower carry Platinum ratings; the Cooler Master and Lian Li models are Gold. Efficiency does not tell you everything about noise, since fan behavior and coil whine are separate considerations.

The Corsair’s Zero RPM mode can stop the fan at light loads, and the Lian Li fan can remain off until around half of its capacity is in use. If quiet operation is the priority, these details are more informative than fan size alone. A 92mm fan appears in the Corsair and Lian Li specifications, but a 92mm fan does not guarantee silence under every system load.

Cables, Connectors and Long-Term Support

Fully modular designs let you connect only the cables your build uses. That can reduce clutter, but short or stiff leads still affect how easily the wiring bends through the case. The Corsair and Cooler Master models have short cable lengths, while the Thermaltake’s stiff cables can make tight routing awkward. Use the case’s actual cable path to decide whether those trade-offs matter.

Check the number and type of GPU cables as well as the main graphics-card connector. The Lian Li includes two PCIe cables, which may not suit every configuration. Warranty length ranges from seven years on Corsair and Thermaltake to 10 years on both Cooler Master units and the Lian Li. In a compact system that also uses a liquid cooler, how radiator clearance affects component placement can help establish the cable route before assembly.

Frequently Asked Questions About SFX PSUs

What wattage SFX PSU do I need for a gaming PC?

A 750W SFX PSU fits a gaming system whose components are suited to that capacity, while an 850W unit provides more output headroom. The Cooler Master V750 SFX White and Lian Li SP750 V2 are 750W models; the other three picks are rated at 850W.

Choose based on the actual CPU, graphics card and planned upgrades rather than the case size alone. Also confirm that the graphics-card cable supports the required connector and power level.

Is an 850W SFX PSU enough for a high-end graphics card?

An 850W PSU can support a high-output compact build, but the exact match depends on the full system and its graphics-card connection. The Cooler Master V850 supports up to 600W on its GPU cable, while the Corsair is rated for 850W total output.

Check the graphics card’s connector needs and the rest of the system’s power draw before settling on a model. Total PSU wattage and the capacity of one GPU cable are related but different limits.

Are SFX power supplies quieter than ATX power supplies?

SFX describes a smaller form factor, not a guaranteed noise level. The Corsair SF850 has Zero RPM mode, and the Lian Li SP750 V2 can keep its fan off at lighter loads; the Cooler Master V850 can produce noticeable coil whine.

Fan noise also depends on how hard the system works and how the case handles airflow. If quiet operation matters, look for fan-stop behavior and consider electrical noise as a separate concern.

Will SFX PSU cables reach inside a mid-tower case?

They may not, because cables designed for short SFF layouts can be too short for a larger case. The Corsair SF850 has particularly compact cables, and the Cooler Master V750 can also be difficult to route in a roomier chassis.

Measure the route from the PSU to the CPU and graphics-card connectors before assembly. An included SFX-to-ATX bracket, such as the one supplied with the Corsair, addresses mounting, not cable length.

What is the difference between 80 PLUS Gold and Platinum?

Gold and Platinum are efficiency certification levels, with Platinum representing the higher class. The Cooler Master V850 and V750 and Lian Li SP750 V2 are Gold-rated; the Corsair SF850 and Thermaltake Toughpower are Platinum-rated.

Efficiency is only one part of the choice. Capacity, cable layout, fan behavior and warranty length can be more important to a particular SFF build than the difference between the two certification levels.

How many PCIe cables should an SFX PSU include?

The right number depends on the graphics card and any other components that need PCIe power. The Lian Li SP750 V2 includes two PCIe cables, while the Corsair SF850 has seven connector positions in total.

Check the required cable types and count before building, rather than assuming the PSU’s wattage guarantees enough connections. Also confirm whether the graphics card uses a native 12V-2×6 cable or separate PCIe power leads.

Final Verdict: Which SFX PSU Should You Buy?

The Best SFX PSUs pick for most high-output compact builds is the Cooler Master V850 SFX White: it combines 850W, a 600W-capable native GPU cable and a 10-year warranty. Its drawback is possible coil whine, so it is not the safest choice for a build where silence is the first priority.

For a quieter, efficiency-focused 850W option, choose the Corsair SF850 (2024). Platinum efficiency and Zero RPM mode suit a small gaming PC that spends time at light loads, but the short cables are a poor match for some larger cases. If the build needs only 750W, the Lian Li SP750 V2 adds a native 12V-2×6 connector, quiet fan behavior and 10-year coverage; check that its two PCIe cables are enough.

The Cooler Master V750 SFX White is the straightforward pick for a white ITX build that can use 750W and short cables. The Thermaltake Toughpower SFX 850W pairs Platinum efficiency with high output, but its early failure concerns make it harder to recommend over the Corsair. If you are undecided, choose the V850 for capacity, or the Corsair SF850 if quiet low-load operation matters more.