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Hey themacmeister! I found somewhere in these forums if you put dev/vendor for 661FX (0x55131039) in the Info.plist SATA section and make sure AppleGenericPCATA.kext is nowhere to be found you'll get udma out of this mobo. The only hitch's are ATA section of About this Mac shows no devices as they end up listed in SATA and if you have any SATA devices they don't show up at all. Still looking to get this solved. Hope this helps. Stwubby Oops, left out the kext to edit AppleVIAATA.kext