I think i have to agree with this. With so many failed attempts at trying to get a good 2600k, I think i'm about ready to say good bye to Sandy.
I've tried the P8P67, TP67XE, and now I'm on the GD-65. I've tried two 2500k and one 2600k. Both chips on the Biostar have been terrible. Surprisingly, the 2600k that wouldn't run on the biostar passed 5ghz, can do 5.3ghz on the GD-65.
I was also using the read points on the GD-65. Setting the vcore to 1.5v in bios, shows 1.488v in windows, and 1.588v on my DMM.