Oracle X7-8 Service Manual page 179

c. Align the processor-heatsink module to the processor socket bolster plate
on the motherboard, matching the pin 1 location (a triangle indicator).
Callout
1
Place the processor-heatsink module on the socket on the motherboard.
d.
The socket bolster plate has alignment pins that go into holes on the processor-heatsink
module to help center the module during installation.
Description
Pin 1 indicator
Install a Processor
Servicing Components 179