There are only 64-bit RAID drivers but no Promise 64-bit SATA drivers for the A8V Deluxe on Windows 7 (and I tried hacking in every driver out there I could find). Therefore, you must set up brand new (or wiped) disks in RAID mode to utilize the two Promise SATA connectors. For any existing disks: They need to go on the VIA connectors, not the promise connectors.
One warning is that you CANNOT do this for existing drives or the beginning of your disk will be wiped by RAID data. Therefore, they will be erased. You will need to plug existing drivers into the 2 VIA SATA slots to copy data.
Otherwise, you can install 32-bit Windows 7 and be able to use SATA on the integrated Promise card, though what a waste so I recommend the RAID approach instead since you don't get any gains from running it in SATA vs RAID mode aside from slightly more disk space.
I personally have 2 1TB drives in Mirroring mode on the Promise card. However, you should be able to have 2 disks, with each as a seperate RAID channel (though you will lose a slight amount of disk space from RAID configuration data versus SATA)