HI,
well it seems that this whole thing is still screaming for another bios update for some.
FWIW Gark Key emailed me asking if I had noticed 10-15% less overclocking ability with the newer bios. This does not suprise me as I think Asus ran the original bios very aggresivley, which is why the overclocks were higher, but ultimatley not usable.
I think this board is more suited towards dual core overclocking, which run at higher multipliers, therfore requiring lower htt speeds for overclocks. Going over 250 HTT causes issues for some.
Chris it would be a good idea to post your findings and issues, to anadtech, driverheaven and also asus technical. If you are interested in fixes, the problems must gain wider recognition. I know it's frustrating, and at times we have all been there with this board, but the only way forwards is to push hard for an update.
My system is fine @ 2.7ghz with an 11X multi, if I go lower, I lose the benefits of the higher HTT by having to use dividers etc, then overclocking becomes finicky.
Raja