1080ti isn't a particularly good Monero mining card. It's EFFICIENT, but the hashrate doesn't justify the price (a BIOS-modded RX 470 can almost match the hashrate at similar power usage).

 Sweet spot there seems to be a modded good-overclocking RX 470/570 or some of the lower-end Pascal NVidia cards (or the GTX 750ti for low-cost rigs still does well at 250 hash/s or so on 50 watts or so power draw in my fairly limited testing that probably was NOT optimised).