Bios F8 beta series was where people started complaining about vcore instability issues at previous stable settings. F7e was fine, and either f8x or f8f was needing more vcore for some people. But they were claiming that their 3dmark scores shot way up after going to f8f.

My UD5 has seen no such issue, but unlike the UD7's, our B2 bioses had completely broken LLC through the entire series (LLC1 overshot like UD7's LLC2, and LLC2 overshot so much that the comps went +.15v higher then restarted), that was only fixed with F1 of B3. So UD5 users can't do a direct comparison like that.

If someone is brave enough, they can try to crossflash a B2 board with a B3 bios, or a B3 with the tried and true f7e, or f8x, with the spiflash andrea had linked in an X58 thread message, that had the ID check removed (you can find it with a simple search). This was also being debated on the GB forums. It was suggested that flashing a B2 with a B3 bios should work fine (if you can avoid the id check), but no one suggested the *opposite*. So anyone brave or foolish enough to try, make sure you know how to invoke the backup BIOS (lee posted the poweroff/psu/case button trick) or you have a second board handy.