ScoobysportD, so what is your average Vcore voltage to run them that high?
I can not seem to get past 832 clock on both mine with a good PS and fans keeping the rear heat sink cool.
When I get to 852 I get too many hardware errors (30% or so).  Vcore I have tried up to 8.2 but did not want to go any higher.  I assume you are runing higher than that?

Thanks,
Bob