Intel Xeon X3440 BX80605X3440 User Manual
Product codes
BX80605X3440
Thermal/Mechanical Specifications and Design Guidelines
59
Sensor Based Thermal Specification Design Guidance
• When DTS i
s a
bove T
CONTROL
, FSC algorithms will use knowledge of T
AMBIENT
and
Ψ
CA
versus RPM to achieve the necessary level of cooling.
This chapter will discuss two implementations. The first is a FSC system that is not
provided the T
provided the T
AMBIENT
information and a FSC system that is provided data on the
current T
AMBIENT
. Either method will result in a thermally compliant solution and some
acoustic benefit by operating the processor closer to the thermal profile. But only the
T
T
AMBIENT
aware FSC system can fully use the specification for optimized acoustic
performance.
In the development of the FSC algorithm it should be noted that the T
AMBIENT
is
expected to change at a significantly slower rate than the DTS value. The DTS value will
be driven by the workload on the processor and the thermal solution will be required to
respond to this much more rapidly than the changes in T
be driven by the workload on the processor and the thermal solution will be required to
respond to this much more rapidly than the changes in T
AMBIENT
.
An additional consideration in establishing the fan speed curves is to account for the
thermal interface material performance degradation over time.
thermal interface material performance degradation over time.