Flatline put me onto a program I didn't know about tonight , 1st time I tried it at 3.5Ghz I had a BSOD in around 3 secs , but after downclocking to 3Ghz , I ran this test on Max for the duration and was stable, this program kicks the shit out of your PC , Prime95 is a pussy in comparison so use this at your own risk .
Use the same stress-testing engine that Intel uses to test their products before they are packed and put on shelves for sale.
http://majorgeeks.com/IntelBurnTest_d5987.html
So my beloved 5 year old Overclocked Q6600 is not as dead as I thought , I did pull my PC apart and dismantled the Zalman 9700 pro and gave it a thorough clean and reseated it with some Promlimatech PK -2 (I wanted PK -3 but was out of stock), well actually I wanted some Artic Silver 5 but that was out of stock also , phone Overclockers before you go to pick stuff up as the new lad doing stock control falls asleep and forgets to update the website (little runt) .
