the bottom gpu is older gtx 780 but i'm only testing the upper one (gtx 1080 fe). With fan set at 90% after 10 minutes the temp stays at 70c stable. With default settings lbry generates 7-8$ / day on nicehash pool. I can get very good prices on gtx 1080 fe in bulk but i'm worried about gpu longevity. If the fan will eventually die, is it cheap to replace it ?