I have just installed a celeron 566 and am running it at 850 with the default voltage. If I have the AGP multiplier set at 1/1 my system will crash, but at 2/3 it runs just fine. To me this says that my video card ( Asus 3400 tnt w/tv out) can't take the 100mhz speed but can deal at 66. Am I sol or are there other ways to tweak this?