I've bought used one EVGA gtx 1070 ti SC black edition, it never been used for mining, but there was a tonn of dust...lol the guy said he didnt clean his pc. I cleant it out and so far in FURMARK temperature is 73C max with 80-95% fan speed and Gpu core 1987-1999mhz on OC. I'm going to google how to recognize if i theres bottleneck occure,if you know - would you write it here?