Dell Alienware M15x (Early 2011) - Manual (Page 19)

CHAPTER 5: MEMORY MODULE(S)
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You can increase your computer memory by installing memory modules on
the system board. See the specifications in your Mobile Manual or in the
Comprehensive Specifications at support.dell.com/manuals for information on
the memory supported by your computer. Install only memory modules that are
supported by your computer.
NOTE: Memory modules purchased from Dell or Alienware are covered
under your computer warranty.
Your computer has two user-accessible SODIMM sockets that can be accessed
from the bottom of the computer.
CHAPTER 5: MEMORY MODULE(S)
CHAPTER 5: MEMORY MODULE(S)