I'm getting 44 Mh/s with this miner:
https://github.com/palginpav/ccminer/releases and -I 20 on my GTX 1080 to 11GB unmodified. Is this right?
Also what are you guys using to edit BIOS file for Nvidia? I was using Polaris BIOS editor for AMD RX 580s. Is there anything similar for Nvidia BIOS?