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Intel
®
Xeon
®
Processor C5500/C3500 Series and LGA1366 Socket
August 2010
Thermal/Mechanical Design Guide
Order Number: 323107-002US
62
Thermal Solutions
Table 7-3.
T
CONTROL
Guidance
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
N
= AVG
N-1
* (1 – 1/2
X
) + Temperature * 1/2
X
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
®
Turbo Boost Technology
Intel
®
Turbo Boost Technology (Intel
®
TBT) is a new feature available on certain
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
CA
as described in
) is one of several
factors that can impact the amount of Intel
®
TBT frequency benefit. Intel
®
TBT
performance is also constrained by ICC, and VCC limits.
TDP
T
CONTROL
Guidance
Comment
85W
-18
Intel
®
Xeon
®
processor EC5549
85W
-16
Intel
®
Xeon
®
processor EC5509
65W
-10
Intel
®
Xeon
®
processor EC3539
60W
-20
Intel
®
Xeon
®
processor LC5528
65W
-14
Intel
®
Xeon
®
processor EC5539
48W
-24
Intel
®
Xeon
®
processor LC5518
30W
-8
Intel
®
Celeron
®
processor P1053
35W
-26
Intel
®
Xeon
®
processor LC3528
23W
-26
Intel
®
Xeon
®
processor LC3518