Here's my current settings and results:
CPU: Intel Xeon E5-2660v2
GPU Driver version: 390.144
CUDA version: 9.0, CUDA runtime: 8.0
sudo nvidia-smi -pl 158
DISPLAY=:0 nvidia-settings -a [gpu:0]/GPUGraphicsClockOffset[2]=+145
DISPLAY=:0 nvidia-settings -a [gpu:0]/GPUMemoryTransferRateOffset[2]=1850
=> 48C P2 161W / 158Wethminer 0.18 or PhoenixMiner 5.4c
both need ethlargement (-straps 2 does nothing)
=> 36.7Mh/sThanks for the info!
System was installed in 2019 -- used nvidia-driver from debian repo and CUDA toolkit had to be installed from nvidia website at the time.
Already watercooled

Tried settings from :
https://miningchamber.com/gpu-mining/gtx-1080-ti-mining-settings/Core Voltage (VDD): NA
Power Limit: 130w
Core Clock (CClock): +40
Memory Clock (MClock): +1600
Result: 33 Mh/s
As of today:

mind sharing your miner, settings and driver version?
try to set mem -502, core +200/220 pl 75...