Oracle X8-2L Service Manual page 153

b. Align the pin 1 indicators between the heatsink and processor carrier in
the packaging tray [1], and place the heatsink (thermal side down) onto the
processor carrier until it snaps in place and lies flat.
The processor carrier has latching posts at each corner: two that insert into heatsink holes
Note -
and two that attach to the edge of the heatsink.
Callout Description
1 Pin 1 indicator
Install a Processor
Servicing Processors (FRU) 153