Specifications

Dell
PowerEdge R715 Technical Guide 24
4.5 ENERGY STAR Compliance
ENERGY STAR
®
qualified configurations can be accessed from the ENERGY STAR Compliance results
landing page on Dell.com.
4.6 Thermal
The PowerEdge R715 thermal solution includes:
• Energy efficient fans with lower power consumption per fan than previous 2U products
• Custom air baffling directs airflow through the components to maintain proper cooling while
improved chassis ventilation ensures sufficient airflow to allow the AMD G34 feature set to be
deployed in a 2U chassis
• Custom designed heat sinks:
o Heat sinks maintain processor and IOB chip temperatures within thermal design targets
o All CPU options (85W, 115W, or 140W) use the same processor heat sink
• Highly Optimized Fan Control Algorithm:
o Component algorithms are used for CPU PID, DIMM PID, HW configuration, IOB, DIMM
throttling for processors, and ambient.
 The highest fan speed request from the component algorithms is used to set
the appropriate fan speed for the blade.
 Ambient and HW Configuration sets the minimum; other algorithms increase
fan speed to maintain proper cooling.
o Base fan speeds are a function of hardware configuration and ambient temperature to
minimize airflow for a given environment. Variables that affect base fan speed
include:
 DIMM size installed (if a single DIMM module [not total system memory] of 16
GB or larger is detected, fans run faster).
 Number of power supplies (two power supplies run system fans slower at high
ambient temperatures; single power supply runs faster due to a required lower
ambient temperature at the power supply).
o DIMM and CPU algorithms use PID Control algorithm to maintain fan speeds for
adequate DIMM and CPU cooling
 Because the DIMMs are located at the front of the system and always receive
fresh inlet air, DIMM throttling is extremely rare.
 The DIMM thermal algorithm has the ability to switch DIMMs to Double Refresh
mode in real time. This behavior is enabled, but is unlikely to be seen under
normal circumstances.
 In single refresh mode (typical) the DIMM thermal specification is 85°C.
 Under Double Refresh mode the DIMM thermal specification increases to 95°C.
 If the DIMM temperature approaches the 85°C limit the thermal algorithm will
put the DIMMs into Double Refresh mode to allow for 10°C of additional
thermal headroom.
 Double Refresh mode allows the hardware to continue operation at maximum
performance—thus no throttling will occur up to 95°C.
The maximum heat dissipation for the R715 is 2694 BTU/hr with the 1100W power supply.