I'm planning a completely new PC build next year, but I'm upgrading to a Radeon RX 9070 XT in the meantime. My current system has an Asus Prime X570-P motherboard, Ryzen 5 5600X, RTX 2060, and a High Power HP1-J700GD-F12S 700W power supply. I'm not sure whether the current PSU has the right power connectors, and 700W may not be enough for the new graphics card anyway.
Most of the replacement power supplies I'm considering are ATX 3.0 or ATX 3.1 models. I've seen conflicting information about whether these standards work properly with older systems, particularly because some newer units may omit the -12V rail. Would an ATX 3.0 or 3.1 PSU be compatible with my motherboard, and what wattage and features should I look for? I'm also considering undervolting the GPU, but I'd prefer a reliable PSU that can carry over to my future build.
2 Answers
ATX 3.0 and ATX 3.1 power supplies are generally compatible with older systems. The missing -12V rail is not automatically a problem for every motherboard; it mainly affects certain board features and specific implementations. Your Asus Prime X570-P should not be disqualified simply because a PSU is ATX 3.0 or 3.1. Just confirm that the PSU includes the standard 24-pin motherboard connector, CPU EPS connector, and the correct PCIe or newer GPU power cable for the graphics card.
I’d replace the 700W unit with a good-quality 850W PSU rather than relying on undervolting. A 9070 XT can put considerable demand on the PSU, and having extra headroom helps prevent crashes during heavy loads. A reputable 850W model should also give you plenty of room for the rest of this system and likely future upgrades. Look for a modern unit with the appropriate native GPU connector, strong reviews, and a long warranty.
That was my thinking too. I could probably reduce power use with an undervolt, but since I’ll need a PSU for the new build anyway, replacing it now seems like the safer option.
I was mainly looking at Corsair models, and some appeared to omit the -12V rail, so I wanted to make sure that wouldn’t cause a compatibility issue with my board.