Dell PowerEdge M820 Owner's Manual page 79

Connectors
Internal
USB
SD
Mezzanine Cards
Mezzanine slots
Video
Video type
Video memory
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
Two 4-pin, USB 2.0-compliant
Two internal SD cards dedicated for the
hypervisor
Four mezzanine PCIe x8 Gen 3 slots supporting
dual-port Gb Ethernet, 10 Gb Ethernet, FC8 Fibre
Channel, or Infiniband mezzanine cards
Matrox G200 integrated with iDRAC
8 MB shared with iDRAC application memory
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.
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