I know I'm lost all the lotteries (7700k stable at only 4.9, MB VRM whines, GPU overclocks poorly and produce much heat), but I still cannot understand why my GPU overclocks worse as I rise the voltage.
With air cooler I was able to get +60 MHz GPU and boost clock was around ~1975 at ~70*C. Idle was 50-53*C (1070 had ~43*C idling, also Strix version). According to reviews Strix 1080Ti should have almost equal temps to Strix 1070, so this already indicates that my chip is not lucky.
With waterblock I could not set GPU frequency any higher, but boost clock stays around 2050 MHz. Temp under full load is ~40-43*C.
But if I try to increase the voltage using voltage tool even +60 becomes unstable. At 1.15V only +30 is stable. It's first time I see higher voltage results in lower OC.
BTW at Kombustor (Furry Donut) GPU power consumption is around 450W@1.1V and 500W@1.15V, seems to be way too high.