Best PC Power Supplies of 2026

The fan in this one doesn't turn at all until the load asks it to. That semi-passive, zero-RPM behavior is the whole argument for the Pure Power 13 M: through idle and ordinary desktop work there's no fan noise because there's no fan running, and when it does spin up it was the quietest unit in this group at load. If the PC lives in a bedroom, a shared office or anywhere near a microphone, start here.

Be quiet! backs the acoustics with a second certificate beyond the 80 PLUS Gold badge: Cybenetics rates the unit Platinum for efficiency and A++ for noise, and the noise rating is the one we pay attention to on a build like this. Inside, an LLC topology and a single 12V rail do the technical work of holding voltage steady, and the 12V-2x6 connector is native, so a modern card connects without an adapter.

Ten years of warranty matches the longest in this group, and the fully modular cable set follows the same logic as the Corsair's: connect what you need and bag the rest. What we can't tell you is how any unit will behave in year five — but a decade of coverage on the part that usually fails first is the reassurance we look for.

Think of the RM1000x as the RM850e with the ceiling taken off. Same Corsair cable philosophy, same Cybenetics Gold rating, same fully modular layout — plus 1000W, ten years of warranty instead of seven, and embossed cables with low-profile combs that hold their shape behind the tray.

The extra capacity exists for one scenario: a flagship graphics card with a power-hungry CPU beside it. Corsair rates the unit at up to 91% efficiency and full ATX 3.1 compliance, which brings PCIe 5.1 and the transient spikes that come with it, and the native 12V-2x6 connector keeps an adapter out of the path to the card.

It's the heaviest unit in this group and feels like it — a big transformer, one 120mm fan, a lot of metal. We don't think most people should buy it, and we also think the people who already know what card they're installing should buy it once rather than upgrading in a year's time.

At 1000W the unit loafs through most gaming sessions, so the fan rarely ramps and the noise you hear will be your graphics card. That's the real argument for capacity beyond what you need: not headroom for its own sake, but a power supply that never has to work hard.

This is the most expensive power supply in our lineup and the only Platinum-rated one, which is the short honest version of what you're paying for. The parts list explains the rest: gallium nitride MOSFETs, large heatsinks over the critical components, and dual ball bearings in the fan where most units at this price use a sleeve bearing.

We noticed the quiet before we noticed the efficiency. Asus runs a 0dB mode that keeps the fan stopped during light gaming, and the heatsinks mean it stays stopped longer than we expected; under a sustained load the fan comes in and stays unobtrusive. Ten years of warranty and a fully modular cable set round out the package, and both match the best here.

Asus markets its GPU-First voltage sensing hardest, claiming up to 45% better voltage delivery to the card. We can't verify a figure like that from the outside, and the honest version of the benefit is steadier power under heavy load — the sort of thing you notice on a bad unit and never think about on a good one. What we can say is that a 1000W Platinum unit with a decade of cover is the least anxious purchase in this guide, provided the budget is there.

Rosewill spends the specification sheet on parts rather than logos: 100% Japanese electrolytic capacitors, a fluid dynamic bearing fan, and excursion ratings of up to 235% for the unit and 300% on the GPU rail. Those percentages describe how far it can overshoot its rating for a fraction of a second — exactly what a modern card asks for when it jumps from idle to full load.

For the money, this is the unit we point people to when they want modular cables without paying flagship prices. You get a fully modular set, a native 12V-2x6 connector, ATX 3.0 and 3.1 compatibility, and a five-year warranty that comfortably covers a typical upgrade cycle.

Where it gives ground is at the top. 750W is comfortable for a mid-range card and a six- or eight-core CPU, and it stops being comfortable with a flagship, so treat it as a ceiling rather than a starting point. Within that ceiling it ran cool, stayed quiet, and gave us nothing to think about — which, for a power supply, is the highest praise going.

Every connector this unit can supply is attached permanently, so a non-modular build means finding a home for cables you may never plug in: the Molex run, the second EPS, the spare SATA chain. In a case with a power-supply shroud that's a couple of velcro ties and a shrug. In a small mATX box with no basement, plan the routing before you screw anything down.

What you get for putting up with that is the most modern feature set at the lowest price here: 750W with 80 PLUS Gold, ATX 3.1 and PCIe 5.1 compliance, and a native dual-color 12V-2x6 connector rated to 450W. The dual-color plug is a small piece of thoughtful design — the second colour shows through if the connector isn't fully seated, which is the mistake that ruins GPU connectors.

Our reservation is about time. Three years of cover is the shortest here by a wide margin, and on a part that's meant to outlive two graphics cards, that limits how confidently we can recommend it for a long-term build. For a first PC on a tight budget, or a machine that will be handed down in a few years, it's the sensible place to save.

Check the connectors before you fall for the wattage. The A650BN's PCIe output is a single daisy-chained cable with two 8-pin ends, and the CPU side is one 8-pin — fine for a mid-range card with a pair of 8-pin sockets, not fine for anything that wants three separate leads or a 12V-2x6.

The rest is honest budget hardware: 650W continuous, 80 PLUS Bronze, a DC-DC design, and the full protection set — over-voltage, over-current, over-power, over-temperature and short circuit — which matters more on a cheap unit than on an expensive one, precisely because it's the cheap unit. The 120mm fan is a low-noise design, and in a mid-tower it never rose above the case fans.

It's non-modular, so the cables you don't use live in the case with you. With a shroud that's invisible; without one it's the usual tangle. The unit itself is compact — under six inches on its longest side — which buys back some of that room.

We keep it in the guide because this is the part people actually put in a first build: cheap enough to leave room for a better GPU, quiet enough to forget, and sized for the 1080p card most people start with. Pair it with a card that needs two 8-pins and no more, and it does the job it's asked to do.

No 12V-2x6, no PCIe 5.1, no modular cables and an 80 PLUS White certificate — the Smart 500W is the least modern power supply we're recommending, and that's precisely why it's still here. It's for the machine that needs none of it: an office desktop, a home server, a ten-year-old tower that needs a working power supply more than it needs a good one.

What it does have is 500W of continuous output rated at 40°C, two PCIe 6+2 connectors, active power factor correction, and the basic protections — over-power, over-voltage and short circuit. It's built to ATX 12V 2.31 and EPS 12V 2.92, which is the standard an older board expects, and the 120mm fan keeps it quiet in a way that's surprising at this end of the market.

Our caveat is longevity. This is a dated design, and a 500W White unit is the kind of part that gets replaced rather than repaired. For a second PC, a workshop machine or an office box, that arithmetic works. For the main machine, it doesn't.

So buy it for a system that draws well under its rating, with integrated graphics or a slot-powered card, and don't buy it for anything you intend to upgrade — there's no connector here for a modern GPU and no headroom for one. The ASRock PRO 750G costs more and asks nothing of you in return.