I am bumping this, I think there should definitely be a rule for limiting the FPS. GTA IV uses four cores, so if someone used a CPU that performs well over just 4 cores, this could pose a large issue.

I'm guessing right now, but I think the best pick would be the Intel Core i7-7740X. Based on calculations that I've done in relation to my setup, I'm thinking you're gonna be able to pull 400 FPS almost constantly with that CPU (especially when using the 1.0.4.0 patch), and while looking down, about 550 FPS. When in an empty spot and looking down, I think one could even reach over 1200 FPS (basically the potential maximum you'll be able to get in the game). These are rough estimates, but I do not think they are too far off.

Please introduce this rule before someone takes advantage. Thank you.