The latest Gigabyte BIOS F7d has certainly helped - busy testing at the moment and have broken my 5.288 GHz barrier of before using water cooling. Both using multiplier and BLCK. So it is not the CPU alone.
Only thing I have done is drop my vcore quite a bit, dropped my PLL and increased my Vtt by one bump up.
So far so good.
More BIOS updates please. :)