Dell OptiPlex 755 User's Guide - Page 244
Power, Physical
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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 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) 244 Ultra Small Form Factor Computer Specifications