I keep my eye on the Folding@Home spreadsheet of GPUs and their price/performance ratios, updated with price changes regularly. My 2012 Mac Mini going full blast does about 5k Points Per Day (PPD), while the Titan X Pascal does 1200k, but performance per Watt is the key metric. https://docs.google.com/spreadsheets/d/1v5gXral3BcFOoXs5n1M6...