Well, I'm on a KT266a motherboard, so 155-170 is all I'm hoping for. I got it to work at 155 from the start on a lower multiplyer, but it was unstable. I'll take out my nic and USB card and test some more. I know heat could also be a problem... My house is 85F with the AC blasting. (Really gotta move or buy another AC unit) Although my cpu is reading 39C at load. Just got a Digidoc, so I'll get the real temp once I hook it up this morning. And I'll give 2.7 volts another go now that I've burned it a little.