HP QUICKSPECS DC7900 - Manual (Page 21)

Unit Environment and
Operating Conditions Ultra-slim Desktop Small Form Factor Convertible Minitower
General Unit Operating Guidelines
Keep the computer away from excessive moisture, direct moisture and the extremes of heat and cold, to ensure that
unit is operated within the specified operating range.
Leave a 10.2 cm (4 in) clearance on all vented sides of the computer to permit the required airflow.
Never restrict airflow into the computer by blocking any vents or air intakes.
Do not stack computers on top of each other or place computers so near each other that they are subject to each
other's re-circulated or preheated air.
Occasionally clean the air vents on the front, back, and any other vented side of the computer. Lint, dust and other
foreign matter can block the vents and limit the airflow.
If the computer is to be operated within a separate enclosure, intake and exhaust ventilation must be provided on the
enclosure, and the same operating guidelines listed above will still apply.
Temperature Range Operating: 50° to 95° F (10° to 35° C)*
Non-operating: –22° to 140° F(–30° to 60° C)
Relative Humidity Operating: 10% to 90% (non-condensing at ambient)
Non-operating: 5% to 95% (non-condensing at ambient)
Maximum Altitude
(unpressurized) Operating: 10,000 ft (3048 m)
Non-operating: 30,000 ft (9144 m)
* Operating temperature is de-rated 1.0 deg C per 300 m (1000 ft) to 3000 m (10,000 ft) above sea level, no direct sustained
sunlight. Maximum rate of change is 10 deg C/Hr. The upper limit may be limited by the type and number of options
installed.
Power Supply Ultra-slim Desktop Small Form Factor Convertible Minitower
Standard Efficiency N/A 240W standard efficiency
active PFC
365W standard efficiency
active PFC
Energy Efficient 135W 87% efficient
active PFC
(external)
240W 85% efficient
active PFC
365W 85% efficient
active PFC
Operating Voltage Range 90 – 264 VAC 90 – 264 VAC 90 – 264 VAC
Rated Voltage Range 100 – 240 VAC 100 – 240 VAC 100 – 240 VAC
Rated Line Frequency 50/60 Hz 50/60 Hz 50/60 Hz
Operating Line Frequency
Range 47 – 63 Hz 47 – 63 Hz 47 – 63 Hz
Rated Input Current N/A 4A 6A
Rated Input Current with
Energy Efficient
* Power Supply
1.5A 3.5A 5A
Current Leakage
(NFPA 99) < 275 µA < 275 µA < 450 µA
System Heat Dissipation N/A Typical 198 btu/hr
(50 kg-cal/hr)
Maximum 1260 btu/hr
(318 kg-cal/hr
Typical 222 btu/hr
(56 kg-cal/hr)
Maximum 1916 btu/hr
(483 kg-cal/hr)
System Heat Dissipation
with Energy Efficient
* Power
Supply
Typical 133 btu/hr
(33.5 kg-cal/hr)
Maximum 549 btu/hr
(132 kg-cal/hr)
Typical 150 btu/hr
(38 kg-cal/hr)
Maximum 1024 btu/hr
(258 kg-cal/hr)
Typical 171 btu/hr
(43 kg-cal/hr)
Maximum 1557 btu/hr
(392 kg-cal/hr)
Ultra-slim Desktop Small Form Factor Convertible Minitower
Power Supply Fan N/A 80mm variable speed 92mm variable speed
FEMP Standby Power
Compliant
(<2W in S5 – Power Off)
*
X X X
Power Consumption in ES
Mode – Suspend to RAM (S3)
(Instantly Available PC) < 2.7W < 2.7W < 2.7W
QuickSpecs
HP Compaq dc7900 Business PC
Technical Specifications
DA - 13029 Worldwide QuickSpecs — Version 24 — 10/30/2009 Page 21