I mine skein or equihash with 6x1080 Ti on Asus Prime Z270-A rigs.
Maybe I'll try 7 or 8 gpus at some point.
Can you give us any number about the power usage?
I just ordered a few 1080ti and I would like to dimension the PSU
Minimum 150-160w per card. I don't remember the power usage at the wall as I did measurements with different numbers of cards.
You might want a bigger PSU as skein is sometimes worth running at 180-200w per card.
Depending on your electricity price the sweetspot might be a lot lower. Hashrates are still very high in the low 200w's.