QG5000XSL9TH Datasheet, PDF (326/458 Pages) Intel Corporation – Intel 5000X Chipset Memory Controller Hub (MCH)

Functional Description
Figure 5-11. Thermal Throttling with THRMHUNT=1
THRMTHRT
THRTLOW
THRTMID
THRTHI
GBLTHRT=0
GBLTHRT=1
Temp. decreasing
THRMODE=0
Temp. increasing
THRMODE=1
THRMHUNT = 1
Tlow
Figure 5-12. Thermal Throttling with THRMHUNT=0
THRMTHRT
THRTLOW
THRTMID
THRTHI
GBLTHRT=0
GBLTHRT=1
Tmid
Temperature
THRMHUNT = 0
Tlow
Tmid
Temperature
5.3.12.6
Closed Loop Activation Throttling Policy
Individual DIMMs flag their thermal state in the FB-DIMM status return. When the
MC.THRMHUNT configuration bit is set, memory reads and writes (summed together)
will be regulated on a per-DIMM-pair basis according to the following algorithm
described in Figure 5-13. Note that the Intel 5000X chipset MCH provides a greater
degree of thermal throttling if there is a sudden temperature spike between from T_low
to T_mid by setting the THRMTHRT register to THRTMID as a starting point when
MC.THRMODE=0. Once this point is reached, if temperature increased further during
the next global window, then THRMTHRT register will be adjusted by the equation
THRMTHRT= MAX(THRMTHRT -2, THRTHI). See staircase effect in Figure 5-11. If
temperature decreased but is still greater than T_mid, then the THRMTHRT will retain its
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Intel^® 5000X Chipset Memory Controller Hub (MCH) Datasheet