Thanks for the votes guys To my mind I haven't done anything special with these mBIOS revisions. I just replace certain parts of the BIOS from other BIOSes with perhaps a little tweak here and there, but it does bring one thing to light - the Asus BIOS dev clearly has no farking clue what their doing.

@ Seanie; It shouldn't matter the BB isn't updated, buy you may find it useful to do so. I have not bothered forcing a BB update simply because it will be a royal pain in the arse should something go wrong with the BB update and trying to get a new BIOS chip for the board. However, as part of the memory table I replace is actually involved with the boot process, there may be some advantages to updating the BB.