HP Compaq nx9500 Series Maintenance And Service Manual page 132

Removal and Replacement Procedures
✎
Carefully clean any thermal paste residue from the heat sink 1
and processor surfaces 2 each time you remove the heat sink.
Apply new thermal paste to both surfaces.
Thermal paste is included with the replacement heat sink
and is also available in the Thermal Paste Kit, spare part
number 346178-001.
Removing the Thermal Paste from the Heat Sink and Processor
Reverse the above procedure to install the heat sink.
Maintenance and Service Guide 5–37