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I have an i5-2500k, I am at 4GHZ with 1.150 Vcore and it bumps to 1.200 sometimes, I ran prime 95 for 1 hour (no errors), does that mean its stable? OR should I bump the Vcore up a little more?
When you are OCing, having an hour of prime95 is for a initial stability test however like lilfiend said, if you want it to be your 24/7 OC running it for 8-12 hours is recommended as this will put many stressors on it and less likely to receive a random crash a month down the road.
I run several tests when OCing, first do simple 30-60 min test to test initial stability, second is a idle test (leaving it on over night). Then I do a real life test (run the apps or games I want to play to see if they work) lastly is a prime95 8-12 hour test.
I do it in that order as I have had a prime95 stable machine for 12+ hours but I couldn't load my game it would BSOD every time I launched it!