Dell Precision M4800 (Late 2013) - Manual (Page 36)

d) keyboard
e) optical drive
f) hard drive
g) palm rest
h) heat-sink fan
i) heatsink
3. Disconnect and un-route any antenna cables connected to the installed wireless cards.
4. Remove the antenna cables from the routing channels.
5. Perform the following steps as shown in the illustration:
a) Loosen the captive screws that secure the video-card heat sink to the computer. [1, 2, 3, 4]
b) Lift up and remove the video-card heat sink from the computer.
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