Best ATX 3.1 Power Supplies of 2026

The RM1000x is the step up you take when 850W feels like a ceiling rather than a comfort zone. We recommend it for a high-end single-GPU build because it pairs 1000W of output with a 10-year warranty and Cybenetics Gold efficiency rated up to 91%. That efficiency matters less on the spec sheet than it does in a compact case: less waste heat means the fan has less reason to spin up, and the unit stays quieter under a long gaming session.

The cable set is the detail that surprised us. Corsair uses embossed cables with low-profile combs, and they are flexible enough to bend behind the motherboard tray without fighting back. The unit itself is heavier than the 850W pick—6.9 pounds—but that weight reads as heatsinks and transformers rather than a cheap steel box. It has the native 12V-2x6 connector and ATX 3.1 compliance you expect at this level, and the 10-year warranty covers it through at least one GPU generation.

The RM1000x earns its keep when you are already shopping for a 5080 or 5090-class card and want the headroom without moving to a 1600W monster. If your build is a midrange gaming PC, the RM850e is the more sensible spend.

The Pure Power 13 M 1000W is the quiet specialist of this group. The box says 80 Plus Gold, but the unit also carries Cybenetics Platinum efficiency and an A++ noise rating, which is a stronger combination than the badge suggests. A 120mm semi-passive fan, LLC topology, and a single 12V rail round out the spec sheet.

At 1000W, it has enough headroom for a 5080 or 9070 XT-class card and a high-end CPU, and the single-rail design handles transient spikes without splitting the load across multiple rails. The fan stays off at low load and only spins up when the heat demands it, so desktop work is silent. The all-black modular cables are easy to route in a mid-tower.

We recommend it for a high-end build where noise matters as much as wattage. The one thing to check is cable length: the set is cut for mid-tower builds, and a full tower with a deep motherboard tray may need extensions or a different route. That is a planning issue, not a performance one, and it is the only reason this unit is not our top pick for every 1000W build.

The Century II's 140mm depth is the first thing we check, because it is the dimension that decides whether a PSU fits a compact mid-tower. At 850W, it has enough output for a 5070 Ti or 9070 XT-class build, and the 135mm fluid dynamic bearing fan with zero RPM mode keeps the unit quiet when the system is idling. The 100% Japanese capacitors and 10-year warranty are the kind of long-game details that matter more than a flashy label.

We recommend it for a compact build that wants modern ATX 3.1 features without paying for a premium badge. The fully modular cable set includes a native 12V-2x6, and the silver metallic finish is a nice change from the usual black box—especially in a case with a window. Installation is straightforward: the unit takes standard ATX screws, and the modular connectors are labeled clearly enough to route without the manual. At 850W it is not the unit for a 5090, but for a mainstream gaming PC it is one of the easiest recommendations here.

A 650W Bronze power supply with a native 12V-2x6 connector looks like a mismatch until you see the job it is built for. The Rosewill VSB is aimed at budget midrange builds that still want a clean connection to a modern GPU, and it manages that with a 120mm ICB fan, 105°C Japanese capacitors, and a five-year warranty.

The 650W rating is enough for a 7600X and 5070-class combination, and the native 12V-2x6 cable means no adapter hanging off the GPU. The semi-modular design keeps the 24-pin and CPU cables fixed, which is a little more to tuck away in a small case, but the rest of the cables detach. The Bronze efficiency means more waste heat than a Gold unit, so it is better suited to a case with decent airflow than a sealed silent box.

We recommend it as the budget pick for a midrange build that wants ATX 3.1 and a native 12V-2x6 without spending much. The 235% power excursion rating and 300% GPU excursion rating give it more transient headroom than the wattage alone suggests, which is reassuring when a modern card spikes. If your parts list fits inside 650W, it is a sensible way to get the modern connector without paying for a Gold-rated 850W unit.

The ASRock PG 1600G is the outlier in this group: 1600W and two native 12V-2x6 connectors. It is built for workstations and dual-GPU setups that need more than one high-power GPU connection, not for a standard gaming PC.

The dual connectors are the headline. Each one has a dual-color design so you can see it is fully seated, and TempGuard monitors the connector temperature. The unit is 80 Plus Gold and Cybenetics Platinum, with a 135mm fan and a 10-year warranty. At 1600W, it has enough headroom for a 5090 and a power-hungry CPU with room to spare.

The unit weighs 9.9 pounds, so it is not the sort of thing you install one-handed while balancing the case on a desk. The fully modular cables help, but you still want a second pair of hands for the initial fit. The 135mm fan stays quiet at moderate load, and the Japanese capacitors are the sort of long-life part you want in a workstation that runs all day.

We recommend it for a workstation or dual-GPU build that genuinely needs 1600W and two native 12V-2x6 connections. For a single-GPU gaming PC, the RM1000x or the Pure Power 13 M is a better use of space and money. The PG 1600G earns its place by doing something the rest of this group cannot: feeding two high-power connectors from one ATX 3.1 unit.

The MAG A750GL is the value question in this group: 750W, 80 Plus Gold, fully modular, a 10-year warranty, and a native dual-color 12V-2x6 connector for less than most 850W units. We see the appeal: it puts the modern connector and long coverage into a budget 750W unit.

The dual-color connector is a genuinely useful detail: the colored section shows when the cable is fully seated, which takes some of the guesswork out of the 12V-2x6 install. The unit is compact and the modular cables are easy to manage. The 750W output is enough for a 5070-class card and a midrange CPU. If you are building a 750W midrange PC and buying from a retailer with a straightforward return policy, it is a reasonable way to save money. For a quiet or mission-critical build, the extra spend on the RM850e or the Century II is easier to justify.