Dell Alienware Area 51 (Late 2009) - Manual (Page 24)

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 Desktop 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 or Alienware are covered
under your computer warranty.
Your computer has three internally-accessible DDR3 DIMM sockets.
CHAPTER 5: MEMORY MODULE(S)
CHAPTER 5: MEMORY MODULE(S)