Reference Guide

● DCPMMs are not supported.
● Tape backup unit is not supported.
Thermal restrictions
Following table lists the configuration required for efficient cooling.
Table 17. Thermal restriction for efficient cooling
Configuratio
n
Number
of
processo
rs
Heatsink Processor blank DIMM
blanks
Fresh air Fan
Eight 2.5 inch
hard drive
system
2 Two heat sinks for CPU <
165W
Not required 12 Yes eight standard
fans
Two heat sinks for CPU ≥
165 W
No
4 Four standard heat sinks
for CPU < 165 W
Not required 24 Yes eight standard
fans
Four heat sinks CPU ≥ 165
W
No
Twenty four
2.5 inch hard
drive system
2 Two standard heat sinks
for CPU < 165W
Not required 12 Yes eight standard
fans
Two heat sinks for CPU ≥
165 W
No
4 Four standard heat sinks
for CPU < 165 W
Not required 24 Yes eight standard
fans
Four heat sinks for CPU ≥
165 W
No
Table 18. 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 19. 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
PowerEdge R940 technical specifications 13