Intel® Server Board Set SE8500HW4 | Server Management |
Fan settings are configurable via SDRs to allow for the specific cooling requirements needed by system integrators. A test command can also be issued to manually force the fan speed to a selected value, overriding any other control or policy.
Ambient system temperature is determined from address 0x90 on private I2C bus 0, which for the Intel® Server Platform SR4850HW4 and Intel® Server Platform SR6850HW4 is a sensor on the SCSI Backplane Board. The temperature value used by server management is this sensor reading minus 3°C. This sensor address is
5.2.1Memory Throttling
Memory throttling is the ability of the chipset to reduce bandwidth of the DIMMs when their generated heat exceeds the normal thermal threshold. Each Memory Board has a temperature sensing device that provides the difference between left and right side of the DIMMs. This difference estimates the heat generated by the DIMMs and is continuously monitored by the BMC. Depending on Memory Board temperature readings, memory may be throttled back and fans nearby to the Memory Board(s) may be boosted. Whenever this temperature reaches the upper critical threshold, the BMC requests the XMB on the Memory Board to enable DIMM throttling. Memory throttling is also enabled when the system intrusion sensor is engaged and in the event of a system fan failure or removal.
5.2.2Processor Throttling
Processor throttling is the ability of the processor to reduce core speed, and thereby its heat, when generated heat exceeds normal thermal thresholds. The processor can throttle itself, and under the following conditions the Intel® Server Board Set SE8500HW4 will request a processor to throttle:
A processor voltage regulator (onboard or module) asserts a thermal trip
The power consumption threshold of the system is crossed
BMC requests all processors to throttle
In the Intel® Server Board Set SE8500HW4 the BIOS will force all processors into a throttled condition when any one processor enters this state. Processor throttling is reset after a system reboot.
Revision 1.0 | 33 |
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