See... that's what my nevermind was, but I figured you knew it..
Anyway, it's probably in your bios.. Press F1 or DEL or whatever your button is to get into your BIOS on boot up, and it's probably under uh.... i have no idea.. but that's where you do it... Select the 266 option where you see 200 (or 133 where you see 100)
Sorry I can not be more helpful, but if you have half a clue.. that should help :beer:😉
Bill