Best ATX 3.1 Power Supplies With a Native 12V-2x6 Cable in 2026

An ATX 3.1 power supply with a native 12V-2x6 cable plugs straight into an RTX 40 or RTX 50 series card with one cable, no squid adapter, and it is built to ride out the short power spikes those cards throw. This guide is a buy-intent shortlist of five such power supplies sold on Amazon US in October 2026, sorted by wattage, noise, size, and warranty. Every claim comes from maker spec sheets and current Amazon listings, not from bench testing. If you want the background first, read what ATX 3.1 and the 12V-2x6 connector actually change.

How to Choose an ATX 3.1 Power Supply

Pick wattage from your graphics card first, then confirm the cable is native, then compare noise, size, and warranty.

• Wattage. NVIDIA's recommended total system power is about 650W for an RTX 5070, 750W for an RTX 5070 Ti, 850W for an RTX 5080 or RTX 4090, and 1000W for an RTX 5090. Add headroom if you run a high-power CPU like a Core i9 or overclock.
• Native 12V-2x6 vs adapter. A native cable runs one 16-pin lead from the PSU to the card. An adapter splits it into two to four 8-pin plugs, which is bulkier and adds more connection points. Every pick here ships a native cable.
• Push it all the way in. Most melted-connector reports trace back to a plug that was not fully seated. The 12V-2x6 header has shorter sense pins so a partly inserted plug limits power, but you still want an audible click and no gap.
• Length. Most ATX cases take a 140 to 160 mm PSU easily. Compact mid-towers and cases with a front-mounted drive cage can be tight, so check the PSU length limit on the case spec sheet.
• Noise. Cybenetics noise ratings run from A++ (quietest) down. A zero-RPM or semi-passive mode stops the fan at light load, which matters most on a PC that spends hours on the desktop.
• Warranty. A 10-year warranty is common at this price. Seven years is fine; anything shorter is a reason to keep looking.

Best Overall: MSI MAG A850GL PCIE5

The MSI MAG A850GL PCIE5 is the safe default for an RTX 5080, RTX 5070 Ti, or RTX 4080 build. It is ATX 3.1 and PCIe 5.1 rated, fully modular, 80 PLUS Gold, and ships a native 16-pin 12V-2x6 cable with a yellow tip that makes it easier to see whether the plug is seated all the way. MSI backs it with a 10-year limited warranty.

At about $110, it is the best seller in Amazon's Computer Power Supplies category, with more than 2,000 ratings averaging about 4.5 stars. The listing calls it compact but does not publish a length or fan size, so measure if your case is tight.

Best for: most RTX 40 and RTX 50 builds up to an RTX 5080. Skip it if you are building around an RTX 5090.

Best Budget: Corsair RM750e (2025)

The Corsair RM750e (2025) is the cheapest native 12V-2x6 power supply here from a major brand. It is ATX 3.1 and PCIe 5.1 compliant, Cybenetics Gold efficient, and fully modular. In the box you get a 600W 12V-2x6 cable, a 12V-2x6 to dual 8-pin cable for older cards, and six SATA connectors.

The casing is only 140 mm long, so it fits nearly any modern ATX case. Corsair uses a 120 mm rifle bearing fan with a low-noise fan curve, 105°C-rated capacitors, and Modern Standby support for fast wake from sleep. The warranty is seven years. It sits at about 4.7 stars on more than 900 ratings for about $90.

Best for: RTX 5070 and RTX 5070 Ti builds and compact mid-towers. Skip it if you plan to move up to an RTX 5080 or faster later.

Best Efficiency and Noise Rating: be quiet! Pure Power 13 M 850W

The be quiet! Pure Power 13 M 850W carries the best third-party ratings in this guide. It is 80 PLUS Gold, but Cybenetics rates it Platinum for efficiency and A++ for noise, the quietest class. A semi-passive mode stops the fan at low load, and the LLC design runs a single 12V rail that be quiet! says handles excursions up to twice its rated power.

It ships a native 12V-2x6 cable plus four PCIe 6+2-pin connectors, so it also suits an older card. The body measures about 6.3 by 5.91 by 3.39 inches (160 mm long), and the warranty is 10 years. It costs about $110 with about 4.6 stars on 200-plus ratings.

Best for: quiet gaming and creator PCs that sit near you. Skip it if your case limits PSU length to 140 mm.

Best for RTX 5090 and 4090: Seasonic Focus GX-1000 ATX 3.1

The Seasonic Focus GX-1000 ATX 3.1 is the pick when the graphics card alone can pull 575W. NVIDIA's guidance for an RTX 5090 is a 1000W system supply, and Seasonic lists this unit as RTX 5090 and Radeon RX 9000 ready with a native 12V-2x6 connector, 80 PLUS and Cybenetics Gold certification, and premium Japanese capacitors.

Cooling comes from a 135 mm fluid dynamic bearing fan with hybrid fan control, which keeps it off at light load. The warranty is 10 years. At about $199 it is the priciest pick, but it has the highest buyer score here at about 4.8 stars.

Best for: RTX 5090 and RTX 4090 builds and heavily overclocked systems. Skip it if your card is an RTX 5080 or slower; an 850W unit saves about $90.

Best Fan-Off Idle: NZXT C850 Gold ATX 3.1

The NZXT C850 Gold ATX 3.1 keeps its fan off until it reaches half load. Zero Fan Mode leaves the 135 mm fluid dynamic bearing fan stopped below 50% load, which covers browsing, office work, and a lot of lighter games. It is 80 PLUS Gold and Cybenetics Gold certified with a Cybenetics A- noise rating, and NZXT uses 100% Japanese capacitors.

The native 12V-2x6 cable is rated up to 600W, and the warranty is 10 years. It costs about $120 with about 4.7 stars on more than 450 ratings. NZXT's listing still markets it as RTX 40 series ready, so check your card's recommended system power if you are on RTX 50.

Best for: PCs that spend most of the day on light work. Skip it if you want the lowest price for 850W.

ATX 3.1 Power Supplies Compared

Related Build Guides

Choosing a case at the same time? The Lian Li Lancool 217 vs Fractal Design North comparison covers two mid-towers that take any PSU on this list. If you put a gaming PC on a battery backup, use a pure sine wave model, since active PFC power supplies like these can shut off on a simulated sine wave UPS during an outage; the APC BR1500MS2 vs CyberPower CP1500PFCLCD comparison covers two that fit, and best UPS battery backups has more options. For the terms, see ATX 3.1 and 12V-2x6.

The Bottom Line

For most RTX 40 and RTX 50 builds, the MSI MAG A850GL PCIE5 is the power supply to buy: 850W, ATX 3.1, a native dual-color 12V-2x6 cable, and a 10-year warranty for about $110. On a budget, the Corsair RM750e (2025) covers RTX 5070 class cards for about $90. For the quietest ratings, get the be quiet! Pure Power 13 M 850W; for an RTX 5090, the Seasonic Focus GX-1000; and for a fan that stays off most of the day, the NZXT C850 Gold.