Hey everyone! I'm gearing up to upgrade my GPU to a 5090 for better VRAM, since I've been hitting limits with my 3080 while working on LLMs and AI projects. Currently, I have an ROG 3080 paired with a 7950x and an older RM850 PSU which has been fine. The 7950x runs ECO mode at 120 watts, and I've undervolted my 3080 to save on power and heat.
With the new card, I'm definitely going to need a new PSU, and I'm a bit confused about the ATX 3.1 standards and what's best to buy.
I'm considering the Corsair RM1000x as it's reasonably priced, but I'm worried it might be close to its limit with power needs. My CPU could push 120 watts, plus my GPU's 600 watts, and around 75 watts from the PCI connector. That leaves only a bit over 200 watts for extras, which seems tight if I push my CPU to the max.
On the other hand, there's the 1200x SHIFT option, but it lacks the 600-watt connector on both ends, raising some concerns. I also looked at the NZXT C1500, but I'm hesitant since the C1200 has poor reviews.
What do you think? Should I just go for the 1000x or is there a better alternative?
4 Answers
I sat on this decision myself and eventually picked up the Seasonic Focus GX1000. I spent quite a bit of time researching and while I don't know every detail about the differences between ATX 3.0 and 3.1, I think the Focus series has a solid reputation. Careful connections are key, just keep that in mind.
Absolutely, connections need to be checked regularly to ensure the build runs smoothly!
Just keep in mind, a 5090 will need 12vhpwr or four 8-pin PCIe connectors via an adapter. Depending on your motherboard, that could mean a total of six connections! Definitely consider this while you're shopping for a PSU.
For ATX 3.1, ensure the sense pins on the 12v2x6 side are shorter, which helps with contact issues. It’s ultimately up to the PSU maker whether to use a 12v2x6 on both sides or the traditional 8-pin. But don’t worry too much—both should work fine! For your setup, I honestly recommend going for a 1200 watt PSU for peace of mind.
Have you checked out the Super Flower Leadex VII 1200? It’s highly rated. Just a warning though, I found that in some regions, options might be limited since they’re mostly ATX 3.0 versions available.
Yeah, I looked into that option, but in DK, it seems like all the Super Flower models are still just ATX 3.0. Kind of sucks when you don’t have many choices!
Right! The main difference is about the power connector design, focusing on better connections without as long sense pins. But remember, a defective pin could still lead to overload risks, so take care of your wiring!