That's weird. I'm able to unlock in hybrid mode with the F2 bios. I went from F2c to F2, though so maybe that's why. It's fixed all my memory stability issues, but my 550 runs hot as well when unlocked. I'm on stock cooler, but I wonder if it's a temp reporting issue as well. I had to rma my video card, so I'm computer-less right now, but when I get the new card I'm getting a Freezer Pro 7 as well, so hopefully I'll have some success with the temps.