P55
E651 – P55 V
PCIe slot 1: 8x
PCIe slot 2: 8x
E653 – P55 LE
PCIe slot 1: 16x
PCIe slot 2: 4x
E655 – P55 SLI
PCIe slot 1: 16x (8x if slot 2 is filled)
PCIe slot 2: 8x
PCIe slot 3: 4x
E657 – P55 FTW
PCIe slot 1: 16x (8x if slot 3 is filled)
PCIe slot 2: 4x
PCIe slot 3: 8x
E658 – P55 FTW 200
PCIe slot 1: 16x (8x if slot 3 is filled)
PCIe slot 2: 16x
PCIe slot 3: 8x
PCIe slot 4: 8x
E659 – P55 Classified 200
PCIe slot 1: 16x (8x if slot 3 is filled)
PCIe slot 2: 4x
PCIe slot 3: 8x
PCIe slot 4: 8x
PCIe slot 5: 8x
PCIe slot 6: 8x
H55
E630 – H55V
PCIe slot 1: 16x
PCIe slot 2: 4x
E635 - H55
PCIe slot 1: 16x
PCIe slot 2: 4x