What is your CPU?

Using a i7-7700k in my main rig cooled with a Corsair H115i, got a i5 3570k in my second rig cooled with a BeQuiet Darkrock.
Asking the same question as Crackisapro.. If you need a cpu for PLAYING Garrys Mod, anything is doable, it's an old game. For servers I'm not sure, haven't had made myself.