Sorry for OT but I had a quick chance to test 970 against 1080, didn't have time to find absolute sweet spots but here are some equihash numbers:
gtx 970 270s/s 2.24s/w=120w
gtx 1080 476s/s 4.43s/w=107w
Whattomine, profitability and difficulty last 24 hours, $0.12/ kWh, profits after power:
gtx 970 $1.35/day
gtx 1080 $2.69/day
So 1080 earned $1.34 more per day, if you sell 970 for $150 and buy 1080 for $500 it will take 350/1.34=261 days to break even. Is that a good deal or not? I guess it depends, at least there is a free slot if you sell two 970´s and upgrade.
Nowadays there is no gpu that can handle every algo well, here is an example where that crappy 970 (above) beats 1080 (below):
gtx 970 270s/s 2.24s/w=120w
gtx 1080 476s/s 4.43s/w=107w
Whattomine, profitability and difficulty last 24 hours, $0.12/ kWh, profits after power:
gtx 970 $1.35/day
gtx 1080 $2.69/day
So 1080 earned $1.34 more per day, if you sell 970 for $150 and buy 1080 for $500 it will take 350/1.34=261 days to break even. Is that a good deal or not? I guess it depends, at least there is a free slot if you sell two 970´s and upgrade.
Nowadays there is no gpu that can handle every algo well, here is an example where that crappy 970 (above) beats 1080 (below):