Dell Precision T7400 (Late 2007) - Manual (Page 272)

272 Adding and Replacing Parts
2 Remove the computer cover (see "Removing the Computer Cover" on
page 141).
3 Remove the memory shroud by loosening its two thumbscrews and lifting
it from the computer.
4 Lift to remove the memory risers, if installed.
5 If a graphics riser card is installed, remove it:
a Remove its four screws.
b Disconnect its power cable.
c Move it slightly up and to the right at an angle to free it from the card
fan and the memory-riser support structure.
d Set the riser aside.
1 memory shroud 2 thumbscrews (2)
3 memory fan (only present on systems without
memory riser cards)
1
2
3