1U 64bit Riser card Quantity in Basket:noneCode: 1U64 Price:$16.00Shipping Weight: 2.00 pounds Quantity: If your MB has 64-bit PCI or PCI-X(up to 133MHz) slot in position B, then you can use this Riser Card. If your MB does NOT have 64-bit PCI slot in position B but it dose in position C, then you may need to use 64-bit riser with ribbon cable. Please see the picture below for reference!