Cuda 10 I'm using, as far as I know cuda 11 is only for newer NVidia cards.... and it's not working for 1080ti. However I have 10 rigs with 6x 1080ti, only one of them is making this kind of issues.
Config: -a ethash -o stratum2+tcp://daggerhashimoto.eu.nicehash.com:3353 -u [wallet] -w $rigName --kernel 0 --mt 6
OC: core +100 / +125 depends of the card;
memory +600
PL 210W
and the OhGodAnETHlargementPill activated.
It's not 90 Watts, this is the SW readings.... I get around 1400w at wall for the whole rig (6x1080ti) so I would say 220W for one 1080ti.
What driver version? I don't think You need OhGod and --mt option , they basically do the same.
I believe that using Nicehash is more stressful for Your rigs because of more often DAG change and creation. Try pointing problematic rig to Eth pool to see how it behaves.