Best SFX Power Supplies of 2026

A 1000W power supply in a case that fits in a backpack sounds like overkill until you look at what people actually build: a flagship card, a high-core processor, and no room for a second power supply or a bigger one later. The SF1000 is the SF750's body with 250W more on tap and the same Platinum rating, and it is the unit we point at when the graphics card is the reason the build exists.

What impressed us most is how little it behaves like a 1000W unit. The fan parks through everyday work, and under a long gaming session it climbs to a hum you notice only because the rest of the machine is silent. Packing this much output into an SFX box without turning it into a hairdryer is the hard part, and Corsair gets it right.

The same caveats that follow every Corsair SF unit follow this one. Cables are short — fine in a purpose-built small-form-factor chassis, awkward if you are routing around a tray — and the PSU-side ends are Type-5 micro-fit, so nothing from an older Corsair set will fit. Neither is a defect; both are the cost of the form factor.

Headroom is the entire argument. If a 12V-2x6 lead is doing the heavy lifting in your build and a transient spike should not be the thing that reboots the machine, this is the unit that keeps the question closed. If your card draws through two 8-pin cables, the SF750 does the same job and leaves more of your budget for the rest of the build.

The 12V-2x6 cable in the SP750 V2's box has two-tone tips — a band of lighter color at the connector housing that disappears into the socket when the plug is fully seated. It is a small thing aimed at a real problem, since a partially seated 12V-2x6 is the one connector in a modern build that can fail at the plug, and it tells you Lian Li has been paying attention to where these builds go wrong.

That cable is native rather than an adapter, so a current card runs off one lead with no squid in the middle. The rest of the package is aimed squarely at small cases: fully modular, ATX 3.1, a 92mm fluid-dynamic-bearing fan that stays parked until the load climbs, and a ten-year warranty that runs longer than the Corsair's.

We put it near the top of this group on value. 750W with Gold efficiency, a native 12V-2x6, and a decade of coverage for midrange money is the sweet spot for most small-form-factor builds, and the extra standby-rail capacity in this revision is the sort of detail that only matters when your board keeps USB ports live through sleep — and then it matters a lot.

The arithmetic is what lands it here. It does nearly everything the Corsair SF750 does — same wattage, same native connector, same true SFX footprint — for noticeably less money and two more years of coverage. That is not a small gap, and it is why this one turns up in so many of the builds we spec ourselves.

Ten years is a long warranty for a brand most builders meet for the first time on a price list, and it is the first thing we noticed about the Vetroo 850W. It is the kind of term you offer when you expect the unit to outlive the case, and it runs longer than Corsair gives on units that cost more. The hardware behind it is 850W at 80 Plus Gold, ATX 3.1 with PCIe 5.1, a 90mm fluid-dynamic-bearing fan, and a standard 4.9 by 3.9 by 2.5-inch SFX footprint.

We rate it the value pick of this roundup. It is the least expensive way here to get 850W with a current ATX 3.1 cable set, the fully modular braided cables are the nicest at this end of the range, and the SFX-to-ATX bracket is in the box for anyone moving it into a bigger chassis.

Installation is unremarkable in the best way — standard mounting, sleeves flexible enough to fold behind a motherboard instead of fighting back, and enough connectors for a high-end board. It is the pick we reach for when the case and the card are where the money went and the power supply has to be good enough without becoming the story of the build.

Cooler Master has revised this unit more than once, and which version you end up with changes the experience more than the spec sheet suggests. The current V850 SFX Gold is the ATX 3.1 model with the 90-degree 12V-2x6 connector and a Cybenetics Noise A- rating; earlier revisions ran a fan curve that ramped hard at low load and were audible from across a room. Buy the ATX 3.1 one.

What you get for the money is 850W of Gold-rated power in a 3.94 by 4.92 by 2.5-inch body, able to push up to 600W to a card through a single 12V-2x6 lead. The 90-degree connector is the detail we appreciate most: the cable leaves the unit flat against the chassis instead of looping into a side panel, which in a 10-liter case is the difference between a panel that closes and one that bulges.

Cable length is the compromise the design makes. These runs are cut for ITX cases and reach comfortably in something like a Jonsbo or an NR200, but they come up short if the power supply sits at the bottom of a mid-tower with a motherboard tray in between. That is a deliberate trade for the case this unit is actually for, and it is why we would not put it in a big build.

Where it lands for us is the middle of this group: a well-built 850W with ten years of coverage and a connector design better thought out than most, at a price that leaves room for the rest of the build. It is the one we reach for when 850W is the requirement and the Corsair premium is not in the budget.

Not every small-form-factor build has a graphics card in it. An APU in a case the size of a hardback, an HTPC under a television, a small NAS — those builds need a power supply that is small, quiet at low draw, and inexpensive, and that is the entire brief the FSP SFX Pro 450W is answering.

It is 80 Plus Bronze and non-modular, built around a DC-to-DC design for voltage regulation, with an 80mm fan that varies with temperature and all-black ribbon cables. FSP includes the SFX-to-ATX bracket, so it drops into a Mini-ITX board or a Micro-ATX office box, and the three-year warranty matches what you expect at this end of the market.

We think it is the right unit for a light build and the wrong one for anything with a card in it. A 65W APU and integrated graphics sit squarely inside what 450W Bronze is for, and at low draw the fan is quiet enough to disappear under a television. What you accept in return is a bundle of cables that has to live somewhere in a case with no spare volume, which is the opposite of what a small build wants.

Compared with Corsair's SF1000, the Toughpower buys the same 1000W and the same Platinum rating for considerably less, and we read that gap as a warning rather than a bargain. This is the pick in the group we trust least, and almost none of that doubt comes from the numbers on the box.

The numbers are genuinely good: ATX 3.1 with a native 12V-2x6 connector, under 30mV of ripple, voltage regulation inside plus or minus 2 percent, 17ms hold-up time, a 90mm fluid-dynamic-bearing fan, a seven-year warranty, and the SFX-to-ATX bracket in the box. On paper it is the most power and the highest efficiency rating here for the least money.

Two details change the calculation. The footprint measures 4.05 inches across the face that should be 100mm, roughly 3mm over the SFX standard, and a case with a machined cutout will not forgive 3mm. And if you are planning around a 600W card, read the rating printed on the bundled 12V-2x6 cable itself — the headline number describes the unit, not necessarily the lead in the box.

The appeal is narrow and specific, then: the most watts and the best efficiency rating here for the least money, in a body that mostly fits. Whether that trade is worth making comes down to how much you value seven years of warranty against ten from the brands around it, and how easy a return would be if the unit turns out to be one of the unlucky ones.