changing the voltage doesnt mean you will make it stable. especially since its quad core...
anyways, have you stress tested with prime95 in 4 different instances? you need to run that and make sure its completely stable for 24hrs or more before you try to overclock anymore, and even then it might not be the processor thats holding you back. try running the memory on a divider. i had a few sticks of ram before that just wouldnt run a memory divider... that held me back so i got rid of them and pushed my overclock an extra 300mhz..
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