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Specifications

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QSSC-S4R Technical Product Specification System Chassis and Sub-Assemblies
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Figure 38. Fan Location
Figure 39. S4R Fan Module
In addition, there are two dual-motor fans located within each power supply drawing air through the hard drives and
across the power distribution board.
Note: The cooling system is non redundant in a non-redundant power supply system configuration.
The zones are designed to be redundant in order to maintain system cooling in the event of fan failure. To maintain
system performance, only one of the eight fans can fail at any one time.
Each fan assembly has a single LED to indicate its status. In the event of a fan failure, the LED illuminates amber.
Failed system fans can be hot swapped out inside of the chassis with the cover removed. The maximum time limit to
perform a fan hot swap operation is three minutes before affecting system performance.
Each fan (or pair of redundant fans in series) provides cooling for a zone of the mainboard that includes two memory
riser slots and one CPU socket. Dividers separate the memory risers to allow for proper airflow for each riser. If only
one memory riser is installed for a fan, a memory air baffle must be installed over the adjacent opening in the fan cage.
The memory air baffle restricts airflow to the area where no memory riser is present, ensuring proper airflow over
installed DIMMS. Memory air baffles are not needed for parts of the mainboard where no memory risers are present.
The system thermal design maintains an operating ambient temperature between 0°- 55°C delivered to the board. This
may result in internal local ambient temperatures greater than 55°C. It is not required that the maximum internal
temperature be less than 55°C in all locations.
The ambient air temperature inside the chassis may exceed 55°C in certain locations such as directly behind the
Boxboro chipset, in close proximity to VR components, and at the exhaust of the PCIe cards. This is not a violation of
the board specification and is normal and expected in those locations.