Intel® 865G/865GV Chipset Datasheet - download.intel.nl - Intel

Functional DescriptionNote:The use of external sensors that include an internal pull-up resistor on the open-drain thermal tripoutput is discouraged; however, it may be possible depending on the size of the pull-up and thevoltage of the sensor.Figure 14. Platform External SensorVEXTTS#R (1)ProcessorGMCHDIMMDIMMTHERM#TSTSIntel ® ICH5SMBusSMBdataSMBclockNOTE:1. External pull-up R is associated with the voltage rail of the GMCH input.5.7.1.1 External Thermal Sensor Usage ModelThere are several possible usage models for an external thermal sensor:• External sensor(s) used for characterization only, not for normal production• Sensor on the DIMMs for temperature in OEM platform and use the results to permanently setread throttle values in the BIOS• Sensor on the GMCH for temperature in OEM platform and use the results to permanently setwrite throttle values in the BIOS• External sensor(s) used for dynamic temperature feedback control in production releases• Sensor on DIMMs, which can be used to dynamically control read throttling• Sensor on GMCH, which can be used to dynamically control write throttlingThe advantage of the characterization model is the Bill-Of-Material (BOM) cost, whereas thepotential advantage of the dynamic model is that retail customers may be able to experience higherpeak performance since the throttle values are not forced to encompass worse case environmentalconditions.Characterization tools (e.g., CTMI and Maxband) can be made to work either with external orinternal sensors.182 Intel ® 82865G/82865GV GMCH Datasheet