Oracle X8-2L Service Manual page 155

Install a Processor
e. Place the processor-heatsink module on the socket on the motherboard.
The socket bolster plate has alignment pins that go into holes on the processor-heatsink
module to help center the module during installation.
f. Ensure that the processor-heatsink module lies evenly on the bolster plate
and that the captive screws align with the threaded socket posts [1].
g. Using a 12.0 in-lbs (inch-pounds) torque driver with a Torx T30 bit, tighten
the processor-heatsink module to the socket. First, fully tighten captive nuts
1 and 2. Then fully tighten nuts 3 and 4 [2].
Servicing Processors (FRU) 155