Never judge a book by its cover(Dell optiplex 9020 SFF)aka an office computer with 16GB ram a SSD the i7 4790 and a Nvidia GPU. Not the greatest but pretty decent imo. :
Dell Optiplex 9020 SFF PC Intel Core i5-4570 3.30GHz 16GB Ram 500GB Win 10 Pro | eBay
Dell Optiplex 9020 SFF Motherboard System Board 0v62h 00V62H for sale online | eBay