You don't need a great GPU, just strong single core CPU performance. If you can't get 480fps on windows the 64bit UT Linux build almost certainly will on the same machine, my pc with a Ryzen 5600 CPU can average 750fps average easily on the combo server, on windows generally limit top to 390 via netspeed. or HZ - 3 if on IG+ servers because of the needed 40-50k netspeed. You can have issues still with super high fps, at 750 I can get stuck to edges of brushes, players, and getting out of water, but with 480 you should be fine.
Even a GT1030 can get you a high refresh rate experience and that is a potato.
Just make sure you have MaxClientRate set high enough that you can also set netspeed high enough while connected to servers. You need at least 31000 limit for 480+fps https://eatsleeput.com/d/647-how-to-allow-higher-fps-online
