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 i5-4570 4x3.2GHz 8GB 480GB SSD BN Windows 10 Home | Computers \ Processor \ Intel Core i5 Computers Computers \ Case \ Small Form Factor SFF Computers \ Brand \ Dell | AMSO
DELL OPTIPLEX 9020 - I7- 3.4 GHZ, 32 GB RAM,500 GB SSD,1 TB SATA HDD, WIN 10 PRO | eBay
PC Computer Ricondizionato Dell Optiplex 9020 SFF Intel Core i5-4430 Ram 8GB SSD 240GB DVD-ROM USB 3.0 Freedos
Amazon.com: DELL OptiPlex 9020-SFF, Intel Core i7-4770 3.4GHZ, 16GB RAM, 2TB Hard Drive, DVDRW, Windows 10 Pro 64bit (Renewed)'] : Electronics
Dell OptiPlex 9020 SFF: Specs and Rack Compatibility - RackSolutions