Your Vcore is awfully low for that speed...granted the winnies use less power and voltage and have lower than normal Vcores I still wonder as to whether or not it's stable. Run Prime95 large FFT's for atleast 12+ hours for stability and of course playing like doom3 is always a good test.
If it's not stable, up the Vcore, make sure your load temps are still fairly low then OC further.