Just to make an additional comment, I sold my two SLI 970s (EVGA SSC ACX 2.0+) three months ago for $420. Prior to the Ethereum craze earlier this year, they were only averaging $150 or so on the used market. It was what prompted me to sell them and make the jump to a 1080Ti instead of waiting for next year's Volta. So there is a benefit to the mining craze for those of us with previous generation GPUs, but that window is rapidly closing. Like Darkbreeze said, I think the peak of the GPU gold rush for mining is about over.