IBM System x3750 M4 Type 8722 Installation And Service Manual page 250

4. Install the adapter on the PCIe riser-card assembly.
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System x3750 M4 Types 8722 and 8733: Installation and Service Guide
a. Align the adapter so that the keys align correctly with the connector on the
system board.
b. Insert the adapter into the connector on the system board until it is firmly
seated.
Attention: Make sure that the adapter is seated correctly. Incomplete
insertion might cause damage to the system board or the adapter.
c. Close the PCIe retention latch.
d. Reconnect the cables to the adapter.
e. Go to step 5 on page 235.
a. Align the adapter so that the keys align correctly with the connector on the
riser-card assembly.
b. Insert the adapter into the connector on the riser-card until it is firmly
seated.
Attention: Make sure that the adapter is seated correctly. Incomplete
insertion might cause damage to the system board, the adapter, and the
PCIe riser card assembly.
c. Close the PCIe retention latch.
d. Reinstall the riser-card assembly onto the system board.
e. Reconnect the cables to the adapter.