Short Duration Tcc Activation And Catastrophic Thermal Management For Intel® Xeon® Processor E5-2400 Product Family; Relief For Intel® Xeon® Processor E5-2400 Product Family - Intel Xeon E5-2400 Thermal/Mechanical Design Manual

Thermal Solutions
To implement this relief, customers must re-write code to set T
values provided in the table below. Implementation is optional. Alternately, the factory
configured T
configured and Relief. Regardless of T
processor type.
Table 5-5. T
CONTROL
TDP, # Core
95W 8C
95W 6C
70W 8C
60W 6C
80W 4C
80W 2C, 1S
In some cases, use of Tcontrol Relief as the trigger point for fan speed control may
result in excessive TCC activation. To avoid this, the adjusted trigger point for fan
speed control (FSC) is defined as:
Tcontrol_FSC = - T
Tcontrol_offset must be chosen such that Tcontrol_FSC < Tcontrol Relief. As such,
Tcontrol_FSC is an earlier trigger point for fan speed control, as compared to Tcontrol
Relief, and can be interpreted as overcooling. When overcooling to Tcontrol_FSC,
margin as defined in
cooling to Tcontrol Relief, overcooling to Tcontrol_FSC:
• May increase frequency benefit from Intel TBT as defined in
• Will increase acoustics
• May result in lower wall power
Customers must characterize a Tcontrol_offset value for their system to meet their
goals for frequency, acoustics and wall power.
5.6.2 Short Duration TCC Activation and Catastrophic Thermal
Management for Intel® Xeon® Processor E5-2400 Product
Family
Systems designed to meet thermal capacity may encounter short durations of
throttling, also known as TCC activation, especially when running non-steady processor
stress applications. This is acceptable and is functionally within the intended
temperature control parameters of the processor. Such short duration TCC activation is
not expected to provide noticeable reductions in application performance, and is
typically within the normal range of processor to processor performance variation.
Normal amounts of TCC activation occur at PECI values less than -0.25. Such
occurrences may cause utilities or operating systems to issue error log.
PECI = -0.25 indicates a catastrophic thermal failure condition in all studies conducted.
As such, to help prevent loss of data, a soft shutdown can be initiated at PECI = -0.25.
Since customer designs, boundary conditions, and failure scenarios differ, this guidance
should be tested in the customer's system to prevent loss of data during shutdown.
PECI command GetTemp() can be used to obtain non-integer PECI values.
Intel® Xeon® Processor E5-2400 Product Family
Thermal/Mechanical Design Guide
values can still be used, or some value between factory
CONTROL
Relief for Intel® Xeon® Processor E5-2400 Product Family
T
CONTROL
-6
-6
-6
-6
-6
-6
+ Tcontrol_offset
CONTROL
Section 5.8.3
values used, BIOS needs to identify the
CONTROL
Relief Max Core Frequency
2.30 GHz or lower
2.40 GHz or lower
1.80 GHz or lower
2.00 GHz or lower
2.20 GHz or lower
2.80 GHz or lower
and Section 5.8.6 can be ignored. As compared to
to the reduced
CONTROL
Factory Configured
-10
-10
-10
-10
-10
-10
Section 5.6.3.
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