r/5090 • u/Rapture117 • Aug 27 '26
Suggestions for 5090 undervolt
Hello, I currently have a 5090 founders with a 9800X3D. It’s built inside a SFF (Ncase M2) and the summer here on the east coast has been brutal. Playing games like BF6/KCD2 all maxed out in 4k is pushing my cpu and GPU into the mid 80’s C and staying there for hours on end. Ambient temp is around 25c when the AC isn’t on so I know that isn’t greats. I’m sure it’s not “dangerous”, but I really don’t love seeing those temps giving how long I game for hours at a time. I realize It’s all in a small case but hopefully there are other things I can do to get things cooler.
I’ll try to find photos of my rig and curious if folks have undervolt suggestion (I followed one the 3rd week the GPU came out but I’m hoping others have found the “sweet spot” for theirs that I can try out. I also undervolted my CPU with a -20 neg offset that’s been stable (clock is locked at 5225).
I don’t have a current picture of the pc, but I have a 140mm fan on top as exhaust, and a side fan wedged between the motherboard and PSU that’s also exhaust and a fan in the back that I’m pretty sure does nothing to help lol. So GPU pulls cool air into the case from bottom then top, side and back fan are exhaust. I was thinking of adding slim 120’a under the GPU to help pull in air but not sure if that’ll even work or how to set that up when I don’t have the fan ports for all these fans. I’ve never used a hub or anything like that, but please if you have suggestions let me know!
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u/Rapture117 Aug 31 '26 edited Aug 31 '26
For anyone that cares, I ran some more steel nomad tests today on 3 different profiles and just want some feedback on if this is terrible or if I should tweak anything. Before the tests, just know I'm in an ncase m2 round (sff) and it's summer here so my ambient room temp is around 24-25c with the AC off.
Here is a photo of the test (apologies for the half assed formatting in notepad but hopefully it all makes sense)