just go into the bios.
unlink ram, (dram frequency) so it stays at stock speeds and does not interfere with the overclock
then raise the cpu fsb (front side bus) by about 20mhz
then boot into windows and stress test your pc with prime95 or intel burn test.
keep an eye on your temps.
then if everything is ok after 20-30mins
go back into bios and raise your fsb by another 20mhz, and stress test again.
then repeat above (it might say bclk frequency)
just keep doing this until your pc wont start,
then just raise your vcore (cpu voltage or vcore) a couple of levels
some settings here
also this is a repeat thread