Dell OpriPlex XE3 Service Manual page 66

6 Install the:
a memory module
b M.2 PCle SSD
c expansion card
d SD card reader
e processor
f heat sink
g heat sink fan
7 Close the front panel
8 Install the:
a front bezel
b side cover
9 Follow the procedure in
66 Disassembly and reassembly
door.
After working inside your computer.