I don't know if this will help but I had the P5K Deluxe and experienced the SATA issues...I sold the board before newer BIOSes came out so I don't know what the situation is now with the DDR2 board(s)...but I am now using a P5K3 Deluxe and with the 604 BIOS I have not experienced a single issue with SATA or RAID...I am currently sing 4 150gb RAPTORS in RAID-0 (red connectors) and a 500gb WD HD for storage in the first black SATA connector....this set-up with my Q6600 overclocked to 3.6ghz is working flawlessly and the performance of the HDs is excellent....I'm guessing this is quality assurance issue with Asus as not all the boards seem to have the issue...they should let people RMA their boards at least...this may never even be fixed via BIOS updates...sad really because when the boards work good. they are excellent.

Vdroop control is also better on this board for me..with it enabled in the BIOS I only get .01 droop whether it's idle or load.