Dell XPS 15 (L521X, Mid 2012) - Manual (Page 26)

Postrequisites
1 If you are replacing the secondary memory-module, go to step 3.
2 If you are replacing the primary memory-module:
a Follow the instructions from step 2 to step 10 in "Replacing the System Board"
on page 57.
b Replace the processor heat-sink. See "Replacing the Processor Heat-Sink" on
page 44.
c Replace the fan. See "Replacing the Fan" on page 42.
d Follow the instructions from step 4 to step 6 in "Replacing the Hard Drive" on
page 29.
e Replace the wireless mini-card. See "Replacing the Wireless Mini-Card" on
page 35.
3 Replace the battery. See "Replacing the Battery" on page 22.
4 Follow the instructions from step 2 to step 7 in "Replacing the Base Cover" on
page 14.
5 Turn on your computer.
As the computer boots, it detects the memory module(s) and automatically updates the
system configuration information.
To confirm the amount of memory installed on your computer:
Click Start
→ Control Panel→ System and Security→ System.
26 | Replacing the Memory Module(s)