Dell OptiPlex 755 - Manual (Page 246)

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Power
DC external power supply:
NOTE: Power consumption from an AC power source
can be zero when the computer is unplugged from
that power source. However, the computer draws a
minute amount of power from the internal coin cell
battery even when the computer is not drawing
power from the AC power source.
Wattage 220 W
Heat dissipation 751 BTU/hr
NOTE: Heat dissipation is calculated based upon the
power supply rating.
Voltage auto-sensing power supplies — 90 to 135 V at 50/60
Hz; 180 to 265 V at 50/60 Hz
Backup battery 3-V CR2032 lithium coin cell
Physical
Without cable cover:
Height 26.4 cm (10.375 inches)
Width 8.9 cm (3.5 inches)
Depth 25.3 cm (9.95 inches)
Weight 4.5 kg (10 lb)
With standard cable cover:
Height 26.4 cm (10.375 inches)
Width 8.9 cm (3.5 inches)
Depth 33 cm (13 inches)
Weight 4.9 kg (10.8 lb)
With extended cable cover: 12.34 kg (27.2 lb)
Height 26.4 cm (10.375 inches)
Width 8.9 cm (3.5 inches)
Depth 36.1 cm (14.2 inches)
Environmental
Temperature:
Operating 10° to 30°C (50° to 86°F)
Storage –40° to 65°C (–40° to 149°F)
Relative humidity 20% to 80% (noncondensing)
Maximum vibration:
Operating 0.25 G at 3 to 200 Hz at 0.5 octave/min
Storage 0.5 G at 3 to 200 Hz at 1 octave/min
Maximum shock:
Operating bottom half-sine pulse with a change in velocity of
50.8 cm/sec (20 inches/sec)
Storage 27-G faired square wave with a velocity change of
508 cm/sec (200 inches/sec)
Altitude:
Operating – 15.2 to 3048 m (–50 to 10,000 ft)
Storage – 15.2 to 10,668 m (–50 to 35,000 ft)
Airborne contaminant level G2 or lower as defined by ISA-S71.04-1985