So I went with the upgrade, and the guy at PC Waterloo basically confirmed my suspicion that the P4 1.8a isn't worth the extra $100 over the 1.6a. He actually pointed out that the p4 CPUs overclock very well, and that by simply modifying the FSB I should be able to get the CPU running much faster (he claimed 2.2 GHz). Can anyone conform how stable this is? I've just tried setting the FSB to 133 instead of 100, clocking my CPU at 2128 MHz, and there doesn't seem to be any problems so far. The monitoriing util is telling me that the CPU temp is at 45C right now, and it's been fluctuating around there for the last hour since I overclocked it (highest it hit was 48 I think). Can't seem to find too much information on what is a "dangerous" range though-anyone have any input?