Dell OptiPlex 390 Mini-Tower Owner's Manual page 88

Controls and Lights
Power Wattage
Mini-Tower 265 W
Desktop 250 W
Small Form 240 W
Factor
Coin-cell 3 V CR2032 lithium coin cell
battery
NOTE: Heat dissipation is calculated by using the power supply wattage rating.
Physical Height
Mini-Tower 36.00 cm (14.17
inches)
Desktop 36.00 cm (14.17
inches)
Small Form 29.00 cm (11.42
Factor inches)
Environmental
Temperature range:
88
Maximum Voltage
Heat
Dissipation
1390 BTU/hr 100 VAC to 240 VAC, 50 Hz to 60 Hz, 5.0 A
1312 BTU/hr 100 VAC to 240 VAC, 50 Hz to 60 Hz, 4.4 A
1259 BTU/hr 100 VAC to 240 VAC, 50 Hz to 60 Hz, 3.6 A;
Width
17.50 cm (6.89
inches)
10.20 cm (4.01
inches)
9.26 cm (3.65
inches)
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.
Depth
41.70 cm (16.42
inches)
41.00 cm (16.14
inches)
31.20 cm (12.28
inches)
Weight
8.87 kg (19.55 lb)
7.56 kg (16.67 lb)
5.70 kg (12.57 lb)