If you want to use the VIA controller I would disable the Promise for now. You enter the VIA BIOS by pressing TAB during BOOTING create your Raid array in there. Here is a thread on creating the Floppy for the VIA controller.
http://forums.pcper.com/showthread.p...33&postcount=2
Note: You can't just move the array from one to the other you will have to rebuild(recreate) the Raid 0 in the VIA controller.
Note2: IF you are going to do this be sure you Delete the array in the Promise controller before hand.