Dell PowerEdge M420 Owner's Manual page 62

Battery
NVRAM backup battery
Environmental
NOTE: For additional information about environmental measurements for specific system configurations, see
dell.com/environmental_datasheets.
Storage Temperature
Standard Operating
Temperature
Expanded Operating
Temperature
≤ 10% of annual operating hours
≤ 1% of annual operating hours
Expanded Operating
Temperature
Restrictions
62
CR 2032 3.0 V Lithium coin cell
–40 °C to 65 °C (–40 °F to 149 °F) with a maximum
temperature gradation of 20 °C per hour.
Continuous operation: 10 °C to 35 °C at 10% to 80% relative
humidity (RH), with 26 °C max dew point. De-rate maximum
allowable dry bulb temperature at 1 °C per 300 m above
900 m (1 °F per 550 ft).
NOTE: When operating in the expanded temperature
range, system performance may be impacted.
NOTE: When operating in the expanded temperature
range, ambient temperature warnings may be reported
on the LCD and in the System Event Log.
5 °C to 40 °C at 5% to 85% RH with 26 °C dew point.
NOTE: Outside the standard operating temperature (10
°C to 35 °C), the system can operate down to 5 °C or
up to 40 °C for a maximum of 10% of its annual
operating hours.
For temperatures between 35 °C and 40 °C, de-rate
maximum allowable dry bulb temperature by 1 °C per 175
m above 950 m (1 °F per 319 ft).
–5 °C to 45 °C at 5% to 90% RH with 26 °C dew point.
NOTE: Outside the standard operating temperature (10
°C to 35 °C), the system can operate down to –5 °C or
up to 45 °C for a maximum of 1% of its annual
operating hours.
For temperatures between 40 °C and 45 °C, de-rate
maximum allowable dry bulb temperature by 1 °C per 125
m above 950 m (1 °F per 228 ft).
Dual-processor configurations are not supported.