Don't know if this will help, but I just installed a Raptor on my P4C800D. I chose to do a clean install and reformatted my existing WD800JB to use as a back-up drive. I installed the Raptor on the southbridge SATA connector as I'm not creating RAID, so I was wondering why there was talk of installing drivers. The southbridge SATA connections don't need drivers (unless you're talking about chipset drivers which have to be installed regardless), only the Promise controller if that's where you're connected. If you're using a single drive, wouldn't you want to use the chipset to control the drive instead of the Promise RAID controller? Anyway, my system works well with no apparent conflicts between SATA and PATA drives. My only complaint is that the most recent BIOS removes the UDMA-6 choice and leaves UDMA-5 as the fastest setting. Still confused about that as the SATA drive can use the faster setting. Have fun with the Raptor - it's definitely faster in plenty of real-world uses.