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I thought, depending on the pin configs, 64bit controllers could sit in 32 bit slots, you just don't get the throughput. Actually, I'm sure this is the case and I've done this for someone recently.

According to 3ware's motherboard compatibility list, it'll work with a selection of boards that have PCI-33 slots, but doesn't mention mine. Since it mentions "64-bit PCI-66" explicitly for other boards, I assume that "PCI-33" means 32-bit/33MHz (does 33MHz even support 64-bit?).

OTOH, I just found a BIOS upgrade that allows support for >128Gb drives with this motherboard, which is why I installed the HPT card in the first place. If I opt for JBOD, I can plug 16 disks in, even without buying the 3ware . Doesn't give me hardware RAID5, though.