dunno if this has any importance, but have you thought about the bandwidth issues here? When using OnBoard IDE, doesn't it just go from the controller to your chipset, so only bandwidth throttling at the controller? Whereas using a PCI card, you have bandwidth throttling first from the controller of the PCI card, then from the PCI bus itself... methinks it seems logical that onboard IDE is prolly faster, whereas an additional ide card would be good for stuff like slave hard drives if ya need them, and your DVD/CD/CDRW/ZIP/LS120 Drives 😀