Intel® Xeon® Processor E5-2400 Product Family
43
Thermal/Mechanical Design Guide
Thermal Solutions
An exponential average of the specification can be calculated using a two time constant
model:
T
DTS_f
=
α
f
x DT x T
DTS_max
+ T
DTS_f_previous
x (1-
α
f
x DT)
T
DTS_s
=
α
s
x DT x T
DTS_max
+ T
DTS_s_previous
x (1-
α
s
x DT)
T
DTS_ave
= C x T
DTS_f
+ (1-C) x T
DTS_s
Where:
T
DTS_max
is the instantaneous spec
T
DTS_f
and T
DTS_s
are the fast and slow time averages
T
DTS_ave
is the final two time constant average specification
α
f
and
α
s
are the time constant coefficients
C is a scale factor
DT is the scan rate and is recommended to be approximately 1 second
below shows the coefficients recommended for averaging. These values may
change per processor SKU. Customers should tune these coefficients based on their
thermal solutions.
5.8.6
Capabilities for the Follow-on Processor
For the follow-on processor, the intercept and slope terms from the T
DTS
equations
(T
LA
,
Ψ
pa
), as defined in
, are stored in the processor. This allows margin
(M) to be reported by the processor. The PECI command for margin (M) will be
RdPkgConfig(), Index 10.
M < 0; gap to spec, fan speed must increase
M
≥
0; margin to spec, fan speed may decrease
Use of RdPkgConfig(), Index 10 with the Intel® Xeon® Processor E5-2400 Product
Family will return an illegal command.
For the follow-on processor, coefficients (
α
f
,
α
s
), scale factor (C) and correction factor
(F) will be factory configured.
§
Table 5-6.
Averaging Coefficients
Heatsink
Performance
α
f
(1/s)
α
s
(1/s)
C
Comment
Low
1.0
0.04
0.30
based on typical processor
Medium
1.0
0.07
0.30
based on typical processor
High
1.0
0.10
0.40
based on typical processor
Содержание Xeon E5-2400
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