Dell PowerEdge R940 EMC Installation and Service Manual - Page 36

Ambient temperature limitations, Particulate and gaseous contamination specifications

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Table 33. Thermal restriction for efficient cooling (continued) Configuration Number of processor s Heatsink Processor blank DIMM Fresh air Fan blanks Four heat sinks for CPU ≥ No 165 W Table 34. NIC card slot restrictions System PowerEdge R940 Configuration Eight 2.5-inch hard drive system Twenty four 2.5-inch hard drive system Slot restriction Ambient restriction Slots 1, 5, and 6 do not 35°C support NIC cards Slots 1, 5, and 6 do not 35°C support NIC cards Ambient temperature limitations The following table lists configurations that require ambient temperature less than 35°C. NOTE: The ambient temperature limit must be adhered to ensure proper cooling and to avoid excess CPU throttling, which may impact system performance. Table 35. Configuration based ambient temperature restrictions System Front drive configuration Processor Thermal Design Power (TDP) PowerEdge R940 Any 150 W/8 core, 165 W/12 core, 200 W, 205 W NVMe Any Any Any Any Any Processor count and Memory Any Any 4 CPUs with DCPMMs Any number of CPUs with NVDIMMs Ambient Restriction 35°C 35°C 35°C 35°C Particulate and gaseous contamination specifications The following table defines the limitations that help avoid any equipment damage or failure from particulate and gaseous contamination. If the levels of particulate or gaseous pollution exceed the specified limitations and result in equipment damage or failure, you may need to rectify the environmental conditions. Remediation of environmental conditions is the responsibility of the customer. Table 36. Particulate contamination specifications Particulate contamination Specifications Air filtration Data center air filtration as defined by ISO Class 8 per ISO 14644-1 with a 95% upper confidence limit. NOTE: The ISO Class 8 condition applies to data center environments only. This air filtration requirement does not apply to IT equipment designed to be used outside a data center, in environments such as an office or factory floor. NOTE: Air entering the data center must have MERV11 or MERV13 filtration. Conductive dust Air must be free of conductive dust, zinc whiskers, or other conductive particles. NOTE: This condition applies to data center and non-data center environments. 36 PowerEdge R940 technical specifications

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Table 33. Thermal restriction for efficient cooling (continued)
Configuration
Number
of
processor
s
Heatsink
Processor blank
DIMM
blanks
Fresh air
Fan
Four heat sinks for CPU ≥
165 W
No
Table 34. NIC card slot restrictions
System
Configuration
Slot restriction
Ambient restriction
PowerEdge R940
Eight 2.5-inch hard drive
system
Slots 1, 5, and 6 do not
support NIC cards
35°C
Twenty four 2.5-inch hard
drive system
Slots 1, 5, and 6 do not
support NIC cards
35°C
Ambient temperature limitations
The following table lists configurations that require ambient temperature less than 35°C.
NOTE:
The ambient temperature limit must be adhered to ensure proper cooling and to avoid excess CPU throttling,
which may impact system performance.
Table 35. Configuration based ambient temperature restrictions
System
Front drive
configuration
Processor Thermal
Design Power (TDP)
Processor count and
Memory
Ambient Restriction
PowerEdge R940
Any
150 W/8 core, 165 W/12
core, 200 W, 205 W
Any
35°C
NVMe
Any
Any
35°C
Any
Any
4 CPUs with DCPMMs
35°C
Any
Any
Any number of CPUs
with NVDIMMs
35°C
Particulate and gaseous contamination specifications
The following table defines the limitations that help avoid any equipment damage or failure from particulate and gaseous contamination. If
the levels of particulate or gaseous pollution exceed the specified limitations and result in equipment damage or failure, you may need to
rectify the environmental conditions. Remediation of environmental conditions is the responsibility of the customer.
Table 36. Particulate contamination specifications
Particulate contamination
Specifications
Air filtration
Data center air filtration as defined by ISO Class 8 per ISO 14644-1 with a
95% upper confidence limit.
NOTE:
The ISO Class 8 condition applies to data center
environments only. This air filtration requirement does not apply
to IT equipment designed to be used outside a data center, in
environments such as an office or factory floor.
NOTE:
Air entering the data center must have MERV11 or
MERV13 filtration.
Conductive dust
Air must be free of conductive dust, zinc whiskers, or other conductive
particles.
NOTE:
This condition applies to data center and non-data center
environments.
36
PowerEdge R940 technical specifications