Lenovo ThinkSystem SR645 Maintenance Manual page 196

Step 3. Install the OCP 3.0 Ethernet adapter.
Notes:
• Ensure that the Ethernet adapter is fully seated and the thumbscrew is securely tightened.
Otherwise, the OCP 3.0 Ethernet adapter will not get full connection and may not function.
• If there is an OCP 3.0 Ethernet adapter installed, when the system is powered off but still
plugged in to AC power, system fans will continue to spin at a much lower speed. This is the
system design to provide proper cooling for the OCP 3.0 Ethernet adapter.
Figure 85. OCP 3.0 Ethernet adapter installation
a. Push the OCP 3.0 Ethernet adapter by its handle on the left until it is fully inserted into the
connector on the system board.
b. Fully tighten the thumbscrew to secure the adapter.
After you finish
Complete the parts replacement. See Complete the parts replacement.
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