My 1ghz core which has been guaranted to run at 1.2+ ran fine for 6 months. Then recently it started to become unstable so I have to put it back a 1.0ghz. The chip was tested at the shop for 24 hrs on a quake timedemo loop test so I worked fine. I don't play Quake for more than an hour anyway. So do you think that overclocking has shortened its life?