HP ProLiant DL560 Gen11 User Manual page 141

b. Lower the heatsink on the processor carrier until the carrier tabs snap into place.
There will be an audible click to indicate that the heatsink is properly latched on the processor carrier.
16. Verify that the processor is securely latched to the processor carrier.
The following illustration calls out the keying feature tabs that secure the processor. Different processor carriers will have these tabs in
different locations.
HPE ProLiant DL560 Gen11 Server User Guide 141