I have been out of the loop for quite a while. I have an Asus P4C800-E Deluxe. Here is a link that has addition information about it.
I have 2 IDE HDDs on my primary P-IDE controller
and 2 optical drives on my secondary P-IDE controller
If I use the onboard SATA (not the promise chip) I heard that will interfere with the secondary P-IDE controller.
I am going to purchase 2 SATA drives and would like to know if I can connected them to the promise raid controller but not use raid.. just use them as single harddrives.