Intel S1200RP Technical Product Specification - Page 62
Static Closed Loop Thermal Throttling Static-CLTT
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Platform Management Functional Overview Intel® Server Board S1200V3RP Type Profile Details OLTT 7 Performance, 3000M altitude CLTT 0 300M altitude CLTT 2 900M altitude CLTT 4 1500M altitude CLTT 6 3000M altitude Each group of profiles allows for varying fan control policies based on the altitude. For a given altitude, the Tcontrol SDRs associated with an acoustics-optimized profile generate less noise than the equivalent performance-optimized profile by driving lower fan speeds, and the BIOS reduces thermal management requirements by configuring more aggressive memory throttling. The BMC only supports enabling a fan profile through the command if that profile is supported on all fan domains defined for the given system. It is important to configure platform Sensor Data Records (SDRs) so that all desired fan profiles are supported on each fan domain. If no single profile is supported across all domains, the BMC, by default, uses profile 0 and does not allow it to be changed. 6.10.4 Memory Thermal Throttling The server board provides support for system thermal management through open loop throttling (OLTT) and closed loop throttling (CLTT) of system memory. Normal system operation uses closed-loop thermal throttling (CLTT) and DIMM temperature monitoring as major factors in overall thermal and acoustics management. In the event that BIOS is unable to configure the system for CLTT, it defaults to open-loop thermal throttling (OLTT). In the OLTT mode, it is assumed that the DIMM temperature sensors are not available for fan speed control. Throttling levels are changed dynamically to cap throttling based on memory and system thermal conditions as determined by the system and DIMM power and thermal parameters. The BMC's fan speed control functionality is linked to the memory throttling mechanism used. The following terminology is used for the various memory throttling options: Static Open Loop Thermal Throttling (Static-OLTT): OLTT control registers that are configured by BIOS MRC remain fixed after post. The system does not change any of the throttling control registers in the embedded memory controller during runtime. Static Closed Loop Thermal Throttling (Static-CLTT): CLTT control registers are configured by BIOS MRC during POST. The memory throttling is run as a closed-loop system with the DIMM temperature sensors as the control input. Otherwise, the system does not change any of the throttling control registers in the embedded memory controller during runtime. Dynamic Open Loop Thermal Throttling (Dynamic-OLTT): OLTT control registers are configured by BIOS MRC during POST. Adjustments are made to the throttling during runtime based on changes in system cooling (fan speed). Dynamic Closed Loop Thermal Throttling (Dynamic-CLTT): CLTT control registers are configured by BIOS MRC during POST. The memory throttling is run as a closedloop system with the DIMM temperature sensors as the control input. Adjustments are made to the throttling during runtime based on changes in system cooling (fan speed). 50 Revision 1.0