Intel 2ND GENERATION CORE PROCESSOR FAMILY DESKTOP - THERMAL MECHANICAL SPECIFICATIONS AND DESIGN GUIDELINES 01-2011 Specifications page 72

This is an improvement over the ambient unaware system but is not fully optimized for
acoustic benefit. The DTS thermal specification required 
speed in this scenario is 1500 RPM. This is less than thermistor controlled speed of
2150 RPM - even if the assumption is a T
in Figure
The shaded area displayed in
For simplicity the graph shows a linear acceleration of the fans from T
T
CONTROL
As the processor workload continues to increase, the DTS value will increase and the
FSC algorithm will linearly increase the fan speed from the 1500 RPM at DTS = -20 to
2150 RPM at DTS value = -1.
Figure 8-7. Fan Response with T
72
8-7.
Figure 8-7
as has been Intel's guidance for simple fan speed control algorithms.
Aware FSC
AMBIENT
Sensor Based Thermal Specification Design Guidance
and therefore the fan
CA
= 35 °C. This is graphically displayed
AMBIENT
is where DTS values are less than T
Thermal/Mechanical Specifications and Design Guidelines
.
CONTROL
- 10 to
CONTROL