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. :
Amazon.com: DELL OptiPlex 9020-SFF, Intel Core i7-4770 3.4GHZ, 16GB RAM, 2TB Hard Drive, DVDRW, Windows 10 Pro 64bit (Renewed)'] : Electronics
How to Add RAM on DELL OptiPlex 9020 SFF - YouTube