OptiGPU
Goal for you: Easily transform your old office PC into a gaming PC capable of running modern games.
Goal for the world: Save 1 million office PCs from landfills.
Install videos are made for you to follow along - Amazon links to each tool and component used to help you find them.
RTX 3050 low profile install in Dell Optiplex 7010 SFF
Installing and Testing GTX 1650 low profile in a Dell Optiplex 7010 SFF
Testing games with Intel Arc A380 in OptiPlex 7010 – no Resizable BAR? 
Installing an Intel Arc A380 in a Dell Optiplex 7010 SFF
Upgrading an Optiplex 7010 SFF to the Max CPU - i7 3770
1080p in-game Showdown: RTX A2000 6GB vs 12GB in Optiplex 7010 SFF
RTX a2000 6GB vs 12GB in a Dell Optiplex 7010 SFF
Optiplex Side Panel 7020 vs 5040 (Shorts Compilation) BIG Difference!
RX 6400 low profile in game testing in an i5 Optiplex 5040
Better is Cheaper? The New Budget Level for PC Gaming
Installing an RX 6400 into a Dell OptiPlex 5040 SFF 
See the Fastest low profile GPU in action! RTX a2000 hands on.
Installing a PNY RTX A2000 low profile in a Dell Optiplex 7010 SFF for gaming
UNLOCK MORE POWER from a Gigabyte GTX 1050 ti in an Optiplex 7020 by using the transplant method
Turning a Dell Optiplex 3020 SFF w/ RX 6400 into a Plex Media Server
Installing an RX 6400 low profile in a dell OptiPlex 3020 SFF
Fixing the CD tray on a classic 1986 Sony CDP-40
Repairing a vintage Talkboy by replacing the drive belt
Installing a Zotac GTX 1650 low profile in an Optiplex 7010 SFF for gaming
9 Months Later - Gigabyte 1050 ti in a Dell Optiplex 7020 SFF - How does it hold up?
GCE Vectrex overlays in Retroarch
Installing an MSI GTX 1050 ti low profile in a Dell Optiplex 7010 SFF for gaming
Installing an MSI GTX 1050 ti low profile in a Dell Optiplex 9020 SFF for gaming
How to assess and replace thermal paste for gaming - Dell Optiplex 9020
Installing an SSD in a Dell Optiplex 9020 SFF
Will It Play? Testing Age of Empires II: Definitive Edition - Budget Gaming Optiplex 7020 & 1050 ti
Top 5 Dell Optiplex Gaming Budget Build Pitfalls
Installing a Gigabyte GTX 1050 ti Low Profile video card into a Dell Optiplex 7020 Small Form Factor