Dell PowerEdge R740xd Installation And Service Manual page 34

Expanded operating temperature
≤ 1% of annual operating hours
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 in the System Event
Log.
Expanded operating temperature restrictions
• 128 GB LRDIMM is not supported for FAC.
• Do not perform a cold startup below 5°C.
• The operating temperature specified is for a maximum altitude of 3050 m (10,000 ft).
• 150 W/8 core, 165 W/12 core and higher wattage processor [Thermal Design Power (TDP)>165 W] are not supported.
• Redundant power supply unit is required.
• Non-Dell qualified peripheral cards and/or peripheral cards greater than 25 W are not supported.
• PCIe SSD is not supported.
• NVDIMM-Ns are not supported.
• Mid drive tray is not supported.
• Rear storage devices or drives are not supported.
• GPU is not supported.
• Tape backup unit is not supported.
Thermal restrictions
Following table lists the configuration required for efficient cooling.
Table 30. Thermal restrictions configuration
Configuration Number of
processors
PowerEdge 1
R740xd
PowerEdge 2
R740xd
34 Technical specifications
Heatsink
One 1U standard heat sink for
CPU ≤ 125 W
One 2U standard heat sink for
CPU > 125 W
Two 1U standard heat sink for
CPU ≤ 125 W
Two 2U standard heat sink for
CPU > 125 W
Specifications
For temperatures between 35°C to 40°C, de-rate maximum allowable
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 29°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
temperature by 1°C per 125 m above 950 m (1°F per 228 ft).
Processor/DIMM
blank
Required
Not required
DIMM Type of air
blanks shroud
Not Standard
required
Not Standard
required
Fan
Four standard
fans and one
blank to cover
two fan slots
Six standard fans