Dell Precision T3400 (Late 2007) - Manual (Page 244)

244
Adding and Replacing Parts
NOTICE:
If you are installing a processor upgrade kit from Dell, discard the original
heat-sink assembly. If you are not installing a processor upgrade kit from Dell, reuse
the original heat-sink assembly when you install your new processor.
5 Open the processor cover by sliding the release lever from under the center
cover latch on the socket. Then, pull the lever back to release the processor.
1 heat-sink assembly 2 captive screw housing (2)
1
2