I honsetly don't know what the hell A.I. is, I think it's a new feature in ATI's control panel that will disable a certian % of shaders thus improving performance without killing image quality. Difference between ATI and nVidia is ATI is up front about it and builds it into the CP. nVidia just did it without saying anything so it was deemed a cheat.
I have never seen any improvement by slimming sys proceses myself, but if you wanna try that, msconfig is the easiest way to do it. Just start in diagnostic mode, then re-boot. If you are on win2000 it can be copied into winnt directory from XP, or found on web. type msconfig on run line