Your GPU is very weak, and because it was a budget card back in the day it doesn’t have support for a “new” technology called Vulkan which is an alternative to OpenGL.
Vulkan is used by Proton (you can think of it as a Windows emulator, even though it’s not exactly an emulator) to convert DirectX calls to something native. Without Vulkan Proton needs to convert DirectX to OpenGL which loses a lot more performance, and in the case of newer games (ones that use DirectX 12) it’s not possible.
So it really depends on what games you want to play, realistically I don’t think you’re playing anything with DirectX12 because those games are all newer than your card, so I don’t think your GPU would support them even in Windows.
I would say give it a go in a separate partition/disk/thumb drive and see how it goes. I don’t think the experience of gaming will be good for you, but I can’t imagine the rest of the PC has good specs if that’s the GPU, so day to day might be a lot more comfortable on Linux without windows hogging down resources.