You may also want to see if there is a new bios for your promise card or motherboard. It is also possible that there may be an issue between the card , drive, and motherboard. You may want to check with asus support to see if there are any problems they are aware of.
Both the card and motherboard have the newest bios' available.
I finally gave up on getting that card to work and traded it to a friend for a promise ultra 66 controller. I've used that model card on this board before and it was fine, and this is one is working well now.