Do I have to run GameUtil at boot, and does it hog my system resources?
You don’t have to run GameUtil at boot, but you loose a VAST amount of cool functionality of the tweaker. This includes things like resetting OC settings after sleep mode, per-game profiles, per-game overclocking, refresh-rate fixing for standard and custom display modes in Win2k and WinXP and many more. GameUtil is a tiny program that sits idle not using any CPU resources until it intercepts a mode change (sleep, refresh, etc) at which time it does its magic, which only takes moments and a miniscule amount of processing power.