I used ccminer and tried to mine with algorithm lbry and the gtx 1070 ti and it crashed the PC every time. It might have just been version of ccminer 2.2.2-tpruvot I was using.
When I had one gtx 1070 ti with a bunch of gtx 1080, it did not crash. It might also be because I was overclocked too, but seems okay on other algorithms. I am sure it is fixable though.