Pretty sure (but too sleepy to verify) all the initial release bioses had PLL overvoltage even for B2.

UD7 was working ok BIOS wise before B3. UD5 got UD7's LLC settings in our B3 F1.

Can you check and see if your board retains the overclock settings after unplugging the PSU (if PLL is off, of course)? That was a new change for F1 on the B3 UD5; it used to lose it...