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. :
Welcome to Chris Hamady .com - Journal - Building a Pretty Incredible Budget Gaming PC Out of a 2013 Dell Optiplex 9020, a GTX 1650, and Various Adapters
Dell OptiPlex 9020 SFF Computer i5-4570 Windows 10 - Grade A
Dell Optiplex 9020 Mini Tower Desktop PC Superior
Refurbished: Dell OptiPlex 9020 Mini Tower 4th Gen Intel Core i7-4770 32 GB DDR3 RAM 1TB SSD + 1TB HD DVD-RW Windows 10 Pro Desktop Computers - Newegg.com
Dell Optiplex 9020 - Refurbished Desktop | PCSP
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Dell OptiPlex 9020 Desktop Computer Intel Core i7 i7 4785T 2.20 GHz 8 GB DDR3 SDRAM 500 GB HDD Windows 7 Professional 64 bit Micro PC Black - Office Depot
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Dell OptiPlex 9020 LGA1150 DDR3 Desktop Motherboard (N4YC8) for sale online | eBay
Dell Optiplex 9020 MT i5-4570 3.2GHz 8GB 120GB SSD DVD Windows 10 Professional 8 GB \ 120GB SSD \ Windows 10 Professional | Computers \ Processor \ Intel Core i5 Computers Computers \ Case \ Micro/Mini Tower Computers \ Brand \ Dell | AMSO