Dell OptiPlex 755 User Manual page 246

Power
DC external power supply:
Wattage
Heat dissipation
Voltage
Backup battery
Physical
Without cable cover:
Height
Width
Depth
Weight
With standard cable cover:
Height
Width
Depth
Weight
With extended cable cover:
Height
Width
Depth
Environmental
Temperature:
Operating
Storage
Relative humidity
Maximum vibration:
Operating
Storage
Maximum shock:
Operating
Storage
Altitude:
Operating
Storage
Airborne contaminant level
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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.
220 W
751 BTU/hr
NOTE: Heat dissipation is calculated based upon the
power supply rating.
auto-sensing power supplies — 90 to 135 V at 50/60
Hz; 180 to 265 V at 50/60 Hz
3-V CR2032 lithium coin cell
26.4 cm (10.375 inches)
8.9 cm (3.5 inches)
25.3 cm (9.95 inches)
4.5 kg (10 lb)
26.4 cm (10.375 inches)
8.9 cm (3.5 inches)
33 cm (13 inches)
4.9 kg (10.8 lb)
12.34 kg (27.2 lb)
26.4 cm (10.375 inches)
8.9 cm (3.5 inches)
36.1 cm (14.2 inches)
10° to 30°C (50° to 86°F)
–40° to 65°C (–40° to 149°F)
20% to 80% (noncondensing)
0.25 G at 3 to 200 Hz at 0.5 octave/min
0.5 G at 3 to 200 Hz at 1 octave/min
bottom half-sine pulse with a change in velocity of
50.8 cm/sec (20 inches/sec)
27-G faired square wave with a velocity change of
508 cm/sec (200 inches/sec)
–15.2 to 3048 m (–50 to 10,000 ft)
–15.2 to 10,668 m (–50 to 35,000 ft)
G2 or lower as defined by ISA-S71.04-1985