I hear that the new XFX models such as the one i bought (XFX HD-687A-ZHFC) has locked voltages. I was only able to get a 30 mhz overclock on the core. I'm kinda bummed out by this. Do u guys suggest flashing to a diff bios to get it unlocked? BTW, I have tried the afterburner eula statement on the config and set unlock voltage to 1, and its a no go.