I have an E6300 in a Biostar Tforce 965PT, using OCZ DDR2 1100mhz. I'm using a Prometia MachII. My problem is that when I first put the OCZ in I tried to run the E6300 around 3550, and it crashed, and ever since if I try to overclock at all straight from the bios it won't boot. I can get up to about 2450 using clockgen, then it crashes. Before I put the OCZ in and tried to go to 3550 I had some A Data PC6400 in it and could run 3300 or 3350 with no problem. Does anybody have any ideas what the problem might be? Any pointers would be greatly appreciated.