Intel E5-2600 manual Dimm Ambient Temperature Write / Read, Dram Channel Temperature Read, Dimm#

Figure 2-14. The Processor DIMM Temperature Read / Write

31	24	23	16	15	8	7	0
			DIMM# 2	DIMM# 1			DIMM# 0
Reserved		Absolute Temp		Absolute Temp			Absolute Temp
		(in Degrees C)		(in Degrees C)			(in Degrees C)
			DIMM Temperature Data
15				3	2		0
			Reserved		Channel Index
			Parameter format

2.5.2.6.5DIMM Ambient Temperature Write / Read

This feature allows the PECI host to provide an ambient temperature reference to be used by the processor for activity-based DRAM temperature estimation. This write is used only when no DIMM temperature information is available from on-board or on-die DIMM thermal sensors. It is also possible for the PECI host controller to read back the DIMM ambient reference temperature.

Since the ambient temperature may vary over time within a system, it is recommended that systems monitoring and updating the ambient temperature at a fast rate use the ‘maximum’ temperature value while those updating the ambient temperature at a slow rate use an ‘average’ value. The ambient temperature assumes a single value for all memory channel/DIMM locations and does not account for possible temperature variations based on DIMM location.

Figure 2-15. Ambient Temperature Reference Data

31	8	7	0
			Ambient
	Reserved		Temperature
			(in Degrees C)
	Ambient Temperature Reference Data

2.5.2.6.6DRAM Channel Temperature Read

This feature enables a PECI host read of the maximum temperature of each channel. This would include all the DIMMs within the channel and all the ranks within each of the DIMMs. Channels that are not populated will return the ‘ambient temperature’ on systems using activity-based temperature estimations or alternatively return a ‘zero’ for systems using sensor-based temperatures.

42	Intel® Xeon® Processor E5-1600/E5-2600/E5-4600 Product Families
	Datasheet Volume One