Dell OptiPlex 990 User Manual - Page 11

Power Coin-cell battery Voltage Wattage Maximum heat dissipation 3 V CR2032 lithium coin cell • Mini Tower - 100 VAC to 240 VAC, 50 Hz to 60 Hz, 5.0 A • Desktop - 100 VAC to 240 VAC, 50 Hz to 60 Hz, 4.4 A • Small Form Factor - 100 VAC to 240 VAC, 50 Hz to 60 Hz, 3.6 A; 100 VAC to 240 VAC, 50 Hz to 60 Hz, 4.0 A • Ultra Small Form Factor - 100 VAC to 240 VAC, 50 Hz to 60 Hz, 2.9 A • Mini Tower - 265 W • Desktop - 250 W • Small Form Factor - 240 W • Ultra Small Form Factor - 200 W • Mini Tower - 1390 BTU/hr • Desktop - 1312 BTU/hr • Small Form Factor - 1259 BTU/hr • Ultra Small Form Factor - 758 BTU/hr NOTE: Heat dissipation is calculated by using the power supply wattage rating. NOTE: The voltage selector switch is available only on non-EPA power supplies. NOTE: See the safety information that shipped with your computer for important voltage-setting information. Physical Height Width • Mini Tower - 36.00 cm (14.17 inches) • Desktop - 36.00 cm (14.17 inches) • Small Form Factor - 29.00 cm (11.42 inches) • Ultra Small Form Factor - 23.70 cm (9.33 inches) • Mini Tower - 17.50 cm (6.89 inches) • Desktop - 10.20 cm (4.01 inches) • Small Form Factor - 9.26 cm (3.65 inches) • Ultra Small Form Factor - 6.50 cm (2.56 inches) 11