It's your clocks.
+150 would be the maximum.
Should be a lot more stable at +100.
Memory clock set to 0.
You are trying to find the fine balance between power consumption and G/s.
What is your G/s? Guessing ~ 20+ G/s for c29?
With NVDIA you should make it work with Afterburner.Must try:
https://www.zotac.com/news/new-and-improved-firestorm-utilitySet fans manual to 60%-80% always.
Temp?
Thanks for the tips ! Will check out the firestorm utility in the morning.
Just shy of 11 G/s for c29 on a single 2080ti. Fans set to 85%. I try to keep the card temps below 70C. Aim for ~65C usually, on both the 1080ti and 2080ti.
Just south of 20 G/s total between the the two cards, however on c29.