i have a q9300 @ 2.5GHz and im looking to overclock it to at least 2.8 GHz if possible. my multiplier is 7.5x, and when i go into the bios and go to overclock settings i see fsb is 333 MHz. so i go and change it to 340 MHz and my cpu wont start. so after i reboot 3 times (my mobo has a auto reset safety feature) i go back and change it from 333 MHz to 335 MHz and it wont start. also should i link or unlink the memory speed? i would really like to understand how to overclock using the bios. but have no idea why such a little increase makes my pc not start. so if anyone could walk me through this its greatly appreciated.