Dell Alienware Area 51 (Late 2009) - Manual (Page 6)

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COMPREHENSIVE SPECIFICATIONS
Drives
Externally accessible
three 5.25-inch drive bays for Blu-ray Disc™
combo, Blu-ray Disc Writer, DVD+/-RW, or DVD
Combo
one 3.5-inch drive bay for Media Card Reader
Internally accessible six 3.5-inch drive bays for SATA-II hard drives
Power
Wattage
1000 W or 1100 W
Voltage 100-240 V AC, 50-60 Hz
Dimensions
Width
249 mm (9.8 inches)
Depth 635 mm (25 inches)
Height
with top vents closed 557.6 mm (22 inches)
with top vents open 595.5 mm (23.4 inches)
added height with the rear
foot deployed
15.4 mm (0.6 inches)
Weight (starting at) 31.7 kg (70 lb)
NOTE: The weight of your desktop is variable
depending on the configuration and the
manufacturing variability.