Dell Alienware Area 51 (Late 2009) - Manual (Page 28)

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CHAPTER 5: MEMORY MODULE(S)
As the computer boots, it detects the additional memory and automatically
updates the system configuration information. To confirm the amount of memory
installed in the computer:
Windows Vista ®
Click Start → Control Panel → System and Maintenance.
Windows ® 7
Click Start → Control Panel → System and Security → System.