I am worried I'll blow it. I have 512MB of Crucial PC2100 that I can't really afford to lose but I wouldn't die if I did. I tried putting it at 266 with a bump in voltage but the machine won't boot. I am afraid to give it a second voltage boost. How much voltage can these safely take? Do they need heat spreaders? Right now I have it at 2.5v. it won't overclock at 2.63 and the last two steps are 2.77, and 2.90. So what should I try?