I jumped ship like 2 years ago too, but kept a "windows game box" i5 8500 with an rx6400 to play.
The sff (usff?) thinkcentre 6500t with linux is so good it's insane. Somewhere 6-9 months ago I just stopped booting the win-box.
One day I'll probably switch os on it and use the better PC as my daily driver, but my quad core is enough for now, crazy actually when I think of the sluggishness of windows on a "+50%" (or more) pc...
It might get to his fragile ego.