Hello everyone,
I'm looking to upgrade my current setup with a 7900XTX and the manufacturer website recommends 850W at a minimum.
As the title says, I currently only possess a 750W PSU (Corsair RM750x (2021)).
Rest of the system (the parts that draw power at least):
Mainboard: Asus TUF GAMING X570-PLUS
CPU: AMD Ryzen 9 3900X
RAM: 4x8GB DDR4
Storage: 1x Samsung 990 Pro 2 TB, 1x Samsung 970 Evo 500 GB, 2x older Samsung SATA SSDs
Fans: 3x Case fans, 1x Noctua CPU cooler (forgot the exact name)
PSU: Corsair RM750x (2021)
Putting everything into PCPartpicker makes it spit out a max load of 608W, but considering that the 3900X can spike to draw up to ~145W (instead of the 105W TDP) and the 7900XTX can spike up to ~530W (instead of the 355W PCPartpicker assumes) I'd have peak loads just short of 850W...
My question now is twofold:
- How reliable is the Power Usage Limit I set in LACT enforced? If I can rely on it to keep the GPU to 355W I should (in theory) be fine, right?
- How bad is it to trigger the overdraw protection in the PSU? Obviously my PC would shut down immediately (with all that entails), but would I risk damage to components?
Thanks for any help :)
PS: I'm set on the 7900XTX, as I want the 24GB VRAM. It's quite literally the cheapest option (new, in my region) that is also a usable gaming card.
PPS: Yes, I'm going to upgrade the PSU soon. Just not now if I can avoid it. (They aren't exactly free...)
How bad is it to trigger the overdraw protection in the PSU? Obviously my PC would shut down immediately (with all that entails), but would I risk damage to components?
I suppose theoretically low voltage could damage something, but I doubt that it's very likely.
I'd probably favor getting the PSU, because otherwise, if you hit any stability issue, you're going to be thinking "is it the PSU"? But I wouldn't be too worried about component damage.
I'm set on the 7900XTX, as I want the 24GB VRAM. It's quite literally the cheapest option (new, in my region) that is also a usable gaming card.
Note that if you're wanting local AI compute capacity --- the likely reason to want a lot of VRAM attached to a GPU other than gaming --- and you can live with less memory bandwidth and a substantial price bump isn't an issue (which it sounds like it is, but just throwing this out there), you might also consider a unified memory computer, like a Framework Desktop, as that can take a lot more memory than a consumer GPU. I have a 24 GB XT 7900 XTX and a 128 GB Framework Desktop, and I've found myself using the latter rather than the former, especially for LLM stuff.
If you're willing to wait until 2028, my expectation is also that memory prices will be better and thus bang-for-buck on local AI compute will also be better. Also give the hardware guys time to iterate on hardware; probably improve performance.
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