Hello,It's an older EVGA 1080 TI 8GB with a single 8 pin connector. I've gone through 2 power supplies in the last 3 years. It's a Z800 DPS-1050 (1250W with GPU12V1 @18A, GPU12V2 @18A on 6 pin connectors P10/P11) The 8 pin adapter appears to be merging the rails.
Given the supply rail amperage, I thought it may be a better solution to get a 3070 card and utilize each rail independently for isolation.