46M1072 5086 PCI Express (2x8) Riser Card (included in standard models) 2
46M1073 5088 PCI Express (1x16) Riser Card 2
46M1074 5087 PCI-X Riser Card (two PCI-X 1.0a 64-bit 133 MHz slots) 2
None* 3734 PCI-Express (2 x8 slots; 1 FH/FL, 1 FH/HL) Riser Card 2 -
None* 4276 PCI-X (2 slots; 1 FH/FL, 1 FH/HL) Riser Card 2 -
None* 4303 PCI-Express (1 x16 slot; FH/FL) Riser Card 2 -
