It’s a little easier when the machine is dedicated to that and only that. The OS doesn’t have all this extra crap running in the background that takes resources from the game because it was designed for that in mind.
At best you’re looking at a 10% performance penalty, closer to the 1-3% range without known bad background software.
At the same time my 3080 runs these games just fine with 60-90 fps at 4k with high settings. Don’t need more than that for games that aren’t competitive.