I've modded the Extreme F8x BIOS and updated the Intel AHCI ROM to 1.20E and Intel RAID ROM to v8.5.0.1030
I tested it by flashing it to my UD5, and AHCI is working great.
If anyone would like to try it:
http://wright-pc.com/pyr0/UD5/EX58_Mod/EX58EXm.F8x
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