Reference Guide
Expanded operating temperature
Table 16. Expanded operating temperature specifications
Expanded operating temperature Specifications
Continuous operation 5°C to 40°C at 5% to 85% RH with 29°C dew point.
NOTE: Outside the standard operating temperature (10°C to
35°C), the system can operate continuously in temperatures as low
as 5°C and as high as 40°C.
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).
≤ 1% of annual operating hours –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).
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.
● DCPMMs 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 17. Thermal restrictions configuration
Configuratio
n
Number
of
processo
rs
Heatsink Processor/DIMM
blank
DIMM
blanks
Type of air
shroud
Fan
PowerEdge
R740
1 One 1U standard heat sink
for CPU ≤ 125 W
Required Not
required
Standard Four standard
fans and one
blank to cover
two fan slots
One 2U standard heat sink
for CPU > 125 W
PowerEdge
R740
2 Two 1U standard heat sink
for CPU ≤ 125 W
Not required Not
required
Standard Six standard
fans
14 Technical specifications