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...)
I don't know about LACT cause i haven't used it, but if you have a good quality psu (and it looks like you have) it should be fine. I was in a similar situation when i went from a vega 64 to a 6950xt. I had an RM650x but 750w was recommened for the 6950xt. I just tried using it without upgrading the psu and for gaming it seemed to work fine. It wasn't until i started messing around with genAI that the psu would turn off my system. I'm assuming the AI stuff hit a power spike that gaming workloads did not. I eventually upgraded to a 1000w psu, but i was able to get by for a bit with the 650w.