The lower PCI-64 riser slot is
connected directly to the gold fingers and plug to the 6th PCI-64 motherboard
slot, while the top PCI-64 riser connector linked w/a 8-wires paddle link is
connected to the C PCI-64 slot of the motherboard. The top and middle slot are
tied together, sharing the same PCI bus signal. For all motherboard with 2 x
PCI-64 66MHz/100MHz on 5th(C) and 6th(B) slot. Doesn't support more than 2
high-speed PCIX mode add-in cards.