xw6600 Workstation Hi. i Don't know how update the bios to Intel AHCI ROM.
Model is HP xw6600 workstation and there is RAID bios instaled.

xw6600 Workstation Bios Help-bios-post-jpg

HP Model: 440307-001
01.46 Rev. A
http://ftp.hp.com/pub/softpaq/sp59001-59500/sp59217.exe

i found here a >Intel AHCI ROM v1.20E<
if this can help
https://skydrive.live.com/?cid=5014229b9...NDiW0pgQ4I