The system does not need to be overclocked, for Promise to bork ATAPI/optical devices it seems.
Also, in case you have Silicon Image SATA controller on your motherboard (which you use), don't get a Silicon Image based PCI card. Those two separate controllers both want to activate their own bios, and when that happens, you get a hard lock.
If you need to boot from your motherboard Silicon Image controller, you can't disable Bios on that.
Most PCI cards (Silicon Image chipset) I've been able to find do not allow disabling the bios on them.
Hence, get a motherboard that does NOT have a Silicon image controller (SATA or parallel ATA) integrated onboard, as it will conflict with a Silicon Image based PCI controller.