I have a RTX3080 gaming box for sale, this is an external GPU for laptops using a thunderbolt 3 connector. It is water cooled and really quiet. Been sitting around for 2 years doing nothing as i've moved on to a desktop RTX3090 long ago. This only works with laptops that have an integrated intel gpu. I've tested it on my son's ryzen integrated gpu and the drivers are incompatible on windows.
details here
https://www.gigabyte.com/Graphics-Card/GV-N3080IXEB-10GD-rev-10