Dell OptiPlex 390 (Mid 2011) - Manual (Page 86)

Controls and Lights
of the computer) and the electrical
outlet.
NOTE: You can test the health
of the power system by
pressing the test button. When
the system power supply
voltage is within specification,
the self-test LED lights up. If the
LED does not light up, the
power supply may be defective.
AC power must be connected
during this test.
Power Wattage Maximum
Heat
Dissipation
Voltage
Mini-Tower 265 W 1390 BTU/hr 100 VAC to 240 VAC, 50 Hz to 60 Hz, 5.0 A
Desktop 250 W 1312 BTU/hr 100 VAC to 240 VAC, 50 Hz to 60 Hz, 4.4 A
Small Form
Factor 240 W 1259 BTU/hr 100 VAC to 240 VAC, 50 Hz to 60 Hz, 3.6 A;
Coin-cell
battery 3 V CR2032 lithium coin cell
NOTE: Heat dissipation is calculated by using the power supply wattage rating.
Physical Height Width Depth Weight
Mini-Tower 36.00 cm (14.17
inches) 17.50 cm (6.89
inches) 41.70 cm (16.42
inches) 8.87 kg (19.55 lb)
Desktop 36.00 cm (14.17
inches) 10.20 cm (4.01
inches) 41.00 cm (16.14
inches) 7.56 kg (16.67 lb)
Small Form
Factor 29.00 cm (11.42
inches) 9.26 cm (3.65
inches) 31.20 cm (12.28
inches) 5.70 kg (12.57 lb)
Environmental
Temperature range:
86