Best settings for my 1080 ti (MSI) for LUX is +50 core, 75% power and 70% fixed fan speed.
Temps below 70C (usually 65-68), silent fan (can sleep at night!) and minor hashpower loss (doing 32mh/s) versus 34ish mh/s with 100% power and +50 OC, but then 75C+ temps and uber high fan speed needed 85+

altminer seems to get a lot of invalids, trying yiimp now