Dell Alienware M17x (Mid 2009) - Manual (Page 26)

CHAPTER 7: 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 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 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 7: MEMORY MODULE(S)
CHAPTER 7: MEMORY MODULE(S)