@ VR - You know you can set OCCT to run as long as you want and or infinitely, yes? If it's proof for others that you have a stable OC you may be spinning your wheels. Mayhaps stick with settings that pass 30 mins of OCCT and just start throwing everything you can at it to see if you encounter BSODS and lockups...If you can pass EVERYTHING but prime you may just want to take a break and just try using your rig for a couple of days...