Peci Averaging And Catastrophic Thermal Management; Intel ® Turbo Boost Technology; Tcontrol Guidance - Intel X3350 - Xeon 2.66 Ghz 12M L2 Cache 1333MHz FSB LGA775 Quad-Core Processor Design Manual

Xeon processor c5500/c3500 series and lga1366 socket hermal/mechanical design guide
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Thermal Solutions
Table 7-3.
T
CONTROL
85W
85W
65W
60W
65W
48W
30W
35W
23W
7.6.2

PECI Averaging and Catastrophic Thermal Management

By averaging DTS over PECI, thermal solution failure can be detected and a soft
shutdown can be initiated to help prevent loss of data.
Thermal data is averaged over a rolling window of 256mS by default (X=8):
AVG
Using a smaller averaging constant could cause premature detection of failure.
The Critical Temperature threshold generally triggers somewhere between PECI of -
0.75 and -0.50. To avoid false shutdowns, initiate soft shutdown at -0.25.
Since customer designs, boundary conditions, and failure scenarios differ, above
guidance should be tested in the customer's system to prevent loss of data during
shutdown.
®
7.6.3
Intel
®
Intel
Turbo Boost Technology (Intel
processor SKUs that opportunistically, and automatically, allows the processor to run
faster than the marked frequency if the part is operating below its power, temperature
and current limits.
Heatsink performance (lower Ψ
factors that can impact the amount of Intel
performance is also constrained by ICC, and VCC limits.
August 2010
Order Number: 323107-002US
Guidance
TDP
T
CONTROL
-18
-16
-10
-20
-14
-24
-8
-26
-26
= AVG
* (1 – 1/2
N
N-1
Turbo Boost Technology
CA
Guidance
Comment
®
®
Intel
Xeon
processor EC5549
®
®
Intel
Xeon
processor EC5509
®
®
Intel
Xeon
processor EC3539
®
®
Intel
Xeon
processor LC5528
®
®
Intel
Xeon
processor EC5539
®
®
Intel
Xeon
processor LC5518
®
®
Intel
Celeron
®
®
Intel
Xeon
processor LC3528
®
®
Intel
Xeon
processor LC3518
X
) + Temperature * 1/2
®
TBT) is a new feature available on certain
as described in
Section
®
TBT frequency benefit. Intel
®
®
Intel
Xeon
Processor C5500/C3500 Series and LGA1366 Socket
processor P1053
X
7.5.1) is one of several
®
TBT
Thermal/Mechanical Design Guide
62

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