IBM System x3550 M5 Type 5463 Installation And Service Manual page 192

Figure 91. PCI riser-card assembly installation (2)
Figure 92. PCI riser-card assembly installation (3)
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IBM System x3550 M5 Type 5463: Installation and Service Guide
1U PCIe Riser 2 assembly
(1x full-height half-length; x16
and 1x low profile; x8 or x16)
1U PCIe Riser 2 assembly
(2 x low profile; x8 or x16)
1U PCIe Riser 1 assembly
(1x ML2; x16)
1U PCIe Riser 1 assembly
(1x ML2; x16)
Bracket