I don't want to upset you but are you aware how protective Apple has been of that OS? Let me sum it up for you.

-> If Apple doesn't sell the computer, it will not run an Apple OS. <-

It was over a decade ago the thin client was all the craze but as computers have crashed in price and power has increased the end of the thin client was years ago. You will see it in some places but that ship has sailed.

-> Your post makes it sound like you want a PC with gaming potential and running either the Apple or Microsoft so you can use some game? If so you are going to get very upset at how such is done today.
Bob