I’m looking into upgrading the GPU of my 2019 rig (3700x) and I’m wondering how necessary it is to follow the manufacturer recommendations on PSU. Originally I decided not to upgrade the 8GB GTX 1080 because it simply sufficed my needs and bought a 650W PSU unit.
Fast forward to 2023 it is apparently difficult to pick a GPU which officially requires <= 650W. I’m looking for an acceptable price/performance/longevity combo and the only option right now appears to be the 4070 (not Ti). If PSU was not an issue I probably would have gone for 7900 XT instead, however paying extra 150 EUR for a new PSU on top of that is silly (let alone rewiring everything). PC Part Picker tells me I have some 70W to spare after installing a 340W Sapphire 7900 XT. I’m also limited by 330cm clearance but that’s less of an issue.
Any thoughts? Thank you.
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If you’re willing to risk it and just try it out first with the old PSU then i would definitely try that first. I have the same PSU as you and i recently upgraded to a 6950xt. So far it’s been running just fine even though AMD recommends a bigger power supply. I was also using a sapphire nitro+ vega 64 before this, which was also quite power hungry when overclocked and never had any issues. I’m not sure how much power a 7900xt draws though.
I’m running a RTX4070 too and was advised to not hold back on PSU. I’ve completed the new built about 2 months ago and people warned me about PSU quality based on the one I had selected first. Better to invest a little more but have stable performance down the line.
NOTE: I’m also running a fairly power hungry CPU.
I ended up with a Corsair RM850x Shift. I did find installation quite a lot easier with the Shift version.
650W should be enough, unless you’re getting a RTX4080 or smth. And as for my personal recommendation for a PSU manufacturer… Uuh, I’ve only used a PSU from deepcool and my current one from seasonic, would recommend seasonic, would not recommend deepcool…
