Best SFX Power Supplies of 2026

Of the 750-watt units here, the SP750 V2 is the least expensive, and it made us re-read the spec list twice: ATX 3.1 certification, a native 12V-2x6 connector, a 92 mm fluid-dynamic-bearing fan and a ten-year warranty — the longest coverage in this group.

That warranty is what earns it a place. Ten years on the cheapest 750-watt unit here is the sort of thing we notice, because a power supply is the one part of a build nobody wants to revisit. The two-tone 12V-2x6 cable turned out to be a small design choice we appreciated more than expected: the color break at the plug makes a fully seated connection obvious at a glance, and a half-seated 12V-2x6 is exactly the mistake that ends a build day early.

Lian Li's fan logic keeps the supply out of the conversation until roughly half load, which in our build meant silence through browsing, documents and video, and only a faint presence during a long game. What you give up is cable count rather than cable quality — two PCIe cables in the box, which is right for a single 12V-2x6 card and wrong for one that wants three separate 8-pins.

If you're feeding a 4090-class card from a case that takes a 125 mm power supply, the SF1000 exists for that build specifically. It's 1000 watts at 80 Plus Platinum in the same 4.92 by 3.94 by 2.5 inch shell as everything else here, with a 92 mm PWM fan, a zero-RPM mode and ATX 3.1 compliance with a native 12V-2x6 connector.

The bundled cable set is braided and the nicest-feeling in this group — flexible enough to bend inside a cramped bay without wanting to spring back. It's also unapologetically short, which is the correct choice for the case this belongs in and a nuisance anywhere else. In a compact ITX chassis that's the whole point; move it into anything with a basement or a channel behind the tray and you're ordering extensions.

A hundred and fifty watts of headroom over our top pick is what the extra money buys, and we think it's worth spending in exactly one situation: a build where the GPU's transient spikes are what keeps you up at night. For a 4070-class card the SF850 does the same job quietly and leaves budget for storage. For a halo build, this is the one we reach for. The SFX-to-ATX bracket in the box also means the supply can follow you into a bigger case later.

Against our top pick, the V850 gives up the Platinum badge and keeps the wattage: 850 watts with 80 Plus Gold and Cybenetics Gold ratings, ATX 3.1 compliance, and a 90-degree 12VHPWR connector for cases where the GPU cable has to turn immediately out of the supply.

It's also cheaper than the Corsair and carries a ten-year warranty instead of seven, which is why it stays on this list despite the noise question below. If your power supply ends up behind a panel and your chair sits a few feet away, the value here is hard to argue with.

Noise is the thing to audition. Earlier revisions of this unit ran an aggressive fan curve that ramped hard at low load, and Cooler Master has since revised it, so confirm you're getting current stock. Coil whine is the other variable: some units stay silent under heavy load, others don't, and the difference doesn't track with anything visible from the outside. Give yourself the return window and listen in the first week.

Set against that, the 850 watts are real and the ten-year coverage matches the longest here. Where it lands for us is a genuinely small case with a GPU that needs the 12V-2x6, and a builder who would rather bank the difference than chase an efficiency badge.

The listed dimensions are where we started with this one: 4.05 by 4.9 by 2.5 inches, against 4.92 by 3.94 by 2.5 for the Corsair units. The height matches, the other two figures don't line up the same way, and it has landed a few millimetres off the standard SFX cutout for some builders. Measure your bay before you order rather than after.

What the money buys is 1000 watts at 80 Plus Platinum with a native 12V-2x6 connector rated to 600 watts, a 90 mm fluid-dynamic-bearing fan, full modularity, an SFX-to-ATX bracket and a seven-year warranty — for substantially less than the Corsair SF1000.

Two things to check before you commit. First, the bundled 12V-2x6 cable: read the rating printed on the cable itself, because that number, not the headline wattage, is what limits your GPU. Second, the long game — the reliability picture on this model is genuinely mixed, with failures showing up inside the first year alongside units that have run for years.

So it's the cheapest route to 1000 watts of Platinum SFX in this group, and it isn't the one we hand to a first-time small-form-factor builder. It makes sense when the budget is fixed, the case bay is measured and you've read the marking on the cable. Otherwise the extra money for the Corsair buys quieter operation and a record we trust more.

The 92 mm fan in the Dagger Pro doesn't turn at all below 20 percent load, and in a small case that's worth more than the spec line suggests: at idle and through most desktop work the power supply adds nothing to the noise floor. It's a fully modular 650-watt 80 Plus Gold unit with Japanese electrolytic capacitors and a seven-year warranty inside a true 4.92 by 3.93 by 2.5 inch SFX body, and it's the pick we point to when 650 watts is genuinely all the build needs.

Genuinely all it needs is the catch. At this price you're within reach of 750-watt units here with newer connector standards, so the Dagger Pro makes sense for a specific system: a compact APU or mid-range GPU build where low-load silence and efficiency matter more than headroom. The modular cable set is the weakest part of the package, serviceable rather than nice, though in a case this small you'll only use three of the runs anyway.

There's no 12VHPWR cable in the GS-650G's box, and the listing says so plainly rather than burying it. That single fact defines the unit: it's a 650-watt 80 Plus Gold SFX supply built for a modest graphics card rather than a halo one, at the lowest price of any Gold-rated SFX unit here.

On paper the list is respectable for the money: fully modular, a fluid-dynamic-bearing fan, Japanese 105°C main capacitors, and the standard protection set — over-voltage, under-voltage, over-power, short-circuit, over-current and over-temperature. Efficiency is 80 Plus Gold on an LLC and DC-to-DC design, which is the architecture you want in this class even if the badge is the only part of it you can check from the outside.

Where it earns a recommendation is a narrow build: a low-draw ITX system where the alternative is an unbranded supply with no efficiency rating at all. Where it doesn't is anything running near its limit — unexplained shutdowns under heavy load are the pattern that turns up around this unit, and a 650-watt ceiling leaves little room for a card that spikes hard. If your GPU wants a 12V-2x6, this isn't the one.