in reference to the OC - running IBT for 10 passes or prime95 for 3 hours is not nearly enough of a stress test. you need to run IBT for atleast 10-12 hours. you could also run linpack for 10-12 hours. from what i've read about prime95 its not nearly as stressful as IBT or linpack.
in reference to raising your voltage - you should still run stability tests to make sure that the new settings are ok. for a rock solid OC you really need to make sure it can run about 24hrs on IBT or linpack. if it does, than it is likely not the OC thats causing your problem.
Disclaimer: 99% of the time I think I am right. If I am wrong, correct me.
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