Intel S2600GZ S2600GZ/GL - Page 178

Intel® Server Board S2600GZ/GL TPS BIOS Setup Utility Comments: The Thermal Throttling Mode chosen reflects whether the DIMMs have Temperature Sensors (TSOD), and whether the chassis is an Intel chassis for which thermal data are available. Note that this is for thermal throttling only, independent of any controls imposed for the purpose of power limiting. 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.  DCLTT is the expected mode for a board in an Intel chassis with inlet and outlet air temperature sensors and TSOD. The firmware can update the offset registers for closed loop during runtime, as BIOS sends the dynamic CLTT offset temperature data.  SCLTT would be used with an OEM chassis and DIMMs with TSOD. The firmware does not change the offset registers for closed loop during runtime, although the Management Engine can do so. Both Static and Dynamic CLTT modes implement a Hybrid Closed Loop Thermal Throttling mechanism whereby the Integrated Memory Controller estimates the DRAM temperature in between actual reads of the memory thermal sensors.  SOLTT is intended for a system with UDIMMs which do not have TSOD. The thermal control registers are configured during POST, and the firmware does not change them. Back to [System Acoustic and Performance Configuration] 1. Altitude Option Values: 300m or less 301m-900m 901m-1500m Higher than 1500m Revision 1.1 165 Intel order number G24881-004