Undervolting issues linked to Win 11 or Bios?

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So I’ve got a problem with something not obvious to me and really don’t have the experience to understand what to look for.

Issue:

I’ve been trying to undervolt my GPU and have had zero success so far. Almost anything from stock frequencies to lower will eventually crash on something. This is especially bizarre to me since I’ve been through about 7 different 30 series gpus over the past year all will eventually prove to be unstable therefore I don’t see silicon lottery as a factor here. Currently I have an EVGA RTX 3090 FTW3 and I’m down to 1790MHz at 875mv crashing at times. I’ve spent hours adjusting these curves at various frequencies and voltages with no luck.

What’s annoying about all this is my partners win 10 rig has had 3 various 30 series cards and they all undervolted perfectly. Currently has a TUF 3080 1860MHz at 875mv with no issues and this was the same previously. All that had to be done was set the undervolt, run superposition, play some games and possibly small adjustments to make if required.

My system just overall isn’t as stable as my partners even at stock and I refused to see this as a win 10 vs 11 issue! xD

Possible causes:

I have undervolted my CPU also but this appears to be running fine since at stock gpu setting I have rarely had crashes. I have tightened my DDR5 ram timings to 36/36/72 since that was one of the memory profiles provided for my Gskill ram kit. (Sticks are cl40 at stock) Maybe this is the issue however extensive OCCT and prime 95 testing was done for both of the above and found no issues…

I also had to change various TPM settings etc to get valorant to work on Win 11 and just followed some of the bios guides which potentially messed something else up.

Specs:

My rig:
I7 12700k
Z690 aorus master
RTX 3090
32GB Gskill DDR5 6000mhz CL40

Partner:
5800x
B550m-k prime
32GB Corsair 3200MHz( yeah I know AMD 3600 blah blah blah)
RTX 3080
 
For the sake of it I would revert the RAM back to stock XMP settings and also the CPU undervolt and see if it really was affecting the GPU undervolt.

How exactly are you undervolting it? There are different methods and the most popular is moving the entire curve down (which really is underclocking) then raising the voltage point to the desired clock (which ends up being an overclock at that voltage). Personally I had slightly better luck leaving the curve as it is, then flattening the top part of the curve since my 3070 FE is a bad undervolter.
 
For the sake of it I would revert the RAM back to stock XMP settings and also the CPU undervolt and see if it really was affecting the GPU undervolt.

How exactly are you undervolting it? There are different methods and the most popular is moving the entire curve down (which really is underclocking) then raising the voltage point to the desired clock (which ends up being an overclock at that voltage). Personally I had slightly better luck leaving the curve as it is, then flattening the top part of the curve since my 3070 FE is a bad undervolter.
Thanks, I’ve flashed my bios in case the beta one I had has some issues. So everything is now stock other than XMP enabled. Gonna check if makes any difference.

I raise the frequency at a given voltage and flatten the curve for anything above.
 
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