I plugged a Dell PercRAID card with a 64-bit connector into a 32-bit PCI slot today -- effectively letting the extra piece of the 64-bit connector dangle freely -- just to see what would happen. As I expected, Windows reported that the device couldn't initialize itself. But then I installed the PercRAID driver for the hell of it, and the card reported that it was working fine. ?!? I haven't connected any SCSI drives to it yet, because I don't have any that I can afford to erase and/or destroy with my little experiment, so I don't know if the card could actually transfer usable data without being connected to a 64-bit PCI slot. I had assumed, though I could be wrong, that if the card were connected improperly that the computer would hang or at least report an error, but it's not doing that; I used the computer all day with no ill effects. For the record, I do have 64-bit slots on my motherboard at work, but I specifically used a 32-bit slot just to see what would happen. Can 64-bit PCI cards plug into 32-bit PCI slots and still work? Or did my experiment reveal a fluke in the design of this particular card and/or my particular motherboard?