Intel 2ND GENERATION CORE PROCESSOR FAMILY DESKTOP - THERMAL MECHANICAL S AND DESIGN GUIDELINES 01-2011, Specifications

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Sensor Based Thermal Specification Design Guidance
76 Thermal/Mechanical Specifications and Design Guidelines
In Figure 8-9 , the red line represents the DTS 1.1 fan speed control implementation. At
75W the fans will be ~ 1600 RPM keeping the Tj at ~ 89C. Blue line represent DTS 1.0
with ambient sensor. The fans with DTS 1.0 will be roughly at the same speed
~ 1650 RPM resulting in Tj at ~ 88 C. The Golden line represents the fan speed control
option where fan ramps to keep the Tj at T
CONTROL
. Fan will be running full speed in this
case with overcooling to CPU to Tj of ~ 81 C. Below T
CONTROL
, the designer can set the
fan speed to minimum or as desired by other system cooling needs.
Notes:
1. Tj is the CPU temperatuers and can be calulated from relative DTS value (PECI) and TjMax register.
Tj = DTS + TjMax(register)
8.5 System Validation
System validation should focus on ensuring the fan speed control algorithm is
responding appropriately to the DTS values and T
AMBIENT
data in the case of DTS 1.0 as
well as any other device being monitored for thermal compliance.
Since the processor thermal solution has already been validated using the TTV to the
thermal specifications at the predicted T
AMBIENT
, additional TTV based testing in the
chassis is not necessary.
Once the heatsink has been demonstrated to meet the TTV Thermal Profile, it should be
evaluated on a functional system at the boundary conditions.
Figure 8-9. Fan Response Comparison with Various Fan Speed Control Options