Havent done Zcash in a while but back then I was doing 770-780 and "IF" i'm lucky 790-800 but very rare this high.
+60 Core
+800 Mem
I also have the power at 115% because free electricity lol.
Fans at 95% because thats what they are designed to be at.
temps were around 60-68C
Several EVGA 1080ti FTW3
Mining Skein at Hashrefinery and Ahashpool seems the best thing right now for these cards.
I actually never saw a single 1080Ti running without crashing with mem above +500. Most of them have problem with +400...
OTOH , the only 2 GTX-1080 (Not Ti) I have can run with +700 without crashing.
What I did was start with +500, I added +50 slowly till I hit 800.. sometimes it would crash 750 sometimes 800 sometimes it's fine - But works fine on an EVGA FTW3 - last time I needed mem clock was with equihash - I purely mine skein right now because it's the most profitable (as per my benchmarks) and that needs more core less mem. Gives about 1080mh/s per card on +100 core -502mem
Bit sad though how bad things going for GPU Mining especially on this beast of a card