Dell Precision T7400 (Late 2007) - Manual (Page 155)

Adding and Replacing Parts 155
4 If you are replacing a processor, remove the processor (see "Removing the
Processor" on page 150).
5 Unpack the new processor, being careful not to touch the underside of the
processor.
NOTICE: You must position the processor correctly in the socket to avoid
permanent damage to the processor and the computer when you turn on the
computer.
6 Open the processor cover by sliding the release lever from under the center
cover latch on the socket. Ensure that the release lever is fully extended.
1 memory shroud 2 thumbscrews (2)
3 memory fan (only present on systems
without memory riser cards)
1
2
3