Dell PowerEdge M820 Owner's Manual page 80

Environmental
≤ 1% of annual operating hours
Expanded operating temperature restrictions
80
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).
• Do not perform a cold startup below 5 °C
• Install only 87 mm wide heat sinks
• Do not install more than 40 DIMMs
• The following do not support expanded
operating temperature range:
– PCIe SSD
– Express flash
– LRDIMMs
– 130 W four-core processors
– Non Dell-qualified peripheral cards and/or
peripheral cards greater than 25 W