Caporegime
Nice.I'm surprised the 7900 XTX is actually smaller than my out going Inno3D 3080 iChill X4. Seems to have helped with airflow installed vertically in a Phanteks P500A case.
I ran Valley benchmark a few time to make it was working correctly and then ran Time Spy which seemed to be about right.
I did read the previous posts about the +15% -150mV adjustments which did seem to make a difference but my GPU only went to -100mV. However I then started to get a problem with the junction temp jumping to 100+ in a couple of games so stopped and re-installed the drivers to fix it. I may try again later.
RTX 7900 XTX compared to INNO3D iChill X4 3080
That 3080 you are replacing is not the best looker is it, and what's up with that weird fan placement?