Thermal/Mechanical Design Guide
39
Thermal Solutions
5.6.1
Fan Speed Control
There are many ways to implement fan speed control. Using processor ambient
temperature (in addition to Digital Thermal Sensor) to scale fan speed can improve
acoustics when DTS > T
CONTROL
.
Table 5-3.
Fan Speed Control, T
CONTROL
and DTS Relationship
5.6.1.1
T
CONTROL
Guidance
Factory configured T
CONTROL
values are available in the appropriate Dear Customer
Letter or may be extracted by issuing a Mailbox or an RDMSR instruction. See the
Intel® Xeon® Processor 5500 Series Datasheet, Volume 1
for more information.
Due to increased thermal headroom based on thermal characterization on the latest
stepping of Intel® Xeon® Processor 5500 Series production processors, customers
have the option to reduce T
CONTROL
to values lower than the factory configured values.
In some situations, use of reduced T
CONTROL
Guidance can reduce average fan power
and improve acoustics. Implementation is optional. Alternately, the factory configured
T
CONTROL
values can still be used. There are no plans to change Intel's specification or
the factory configured T
CONTROL
values on individual processors.
To implement this guidance, customers must re-write code to set T
CONTROL
to the
reduced values provided in the table below.
Implementation of T
CONTROL
Guidance above maintains Intel standards of reliability
(based on modeling of the Intel Reference Design). Implementation of T
CONTROL
of -1
may increase risk of throttling (Thermal Control Circuit activation). Increased TCC
activation may or may not result in measurable performance loss.
Thermal Profile still applies. If PECI >= T
CONTROL
Guidance, then the case temperature
must meet the Thermal Profile.
T
CONTROL
values for the follow-on processor are TBD but expected to be in the range of
the factory configured T
CONTROL
values for Intel® Xeon® Processor 5500 Series.
Regardless of T
CONTROL
values used in Intel® Xeon® Processor 5500 Series, BIOS
needs to identify the processor type. For the follow-on processor, the fan speed control
algorithm needs to use the follow-on processor's factory configured T
CONTROL
values.
Condition
FSC Scheme
DTS
≤
T
CONTROL
FSC can adjust fan speed to maintain DTS
≤
T
CONTROL
(low acoustic region).
DTS
>
T
CONTROL
FSC should adjust fan speed to keep T
CASE
at or below the Thermal Profile
specification (increased acoustic region).
Table 5-4.
T
CONTROL
Guidance
TDP
T
CONTROL
Guidance
Comment
95W
-10
Intel® Xeon® Processor 5500 Series with 2.93 GHz Max Core Frequency
95W
-1
Intel® Xeon® Processor 5500 Series frequencies lower than 2.93 GHz
80W
-1
Intel® Xeon® Processor 5500 Series 2.53 GHz or lower, except Embedded (NEBS)
60W
-1
Intel® Xeon® Processor 5500 Series 2.26 GHz or lower, except Embedded (NEBS)
Содержание Xeon 5500 Series
Страница 8: ...8 Thermal Mechanical Design Guide ...
Страница 12: ...Introduction 12 Thermal Mechanical Design Guide ...
Страница 26: ...Independent Loading Mechanism ILM 26 Thermal Mechanical Design Guide ...
Страница 42: ...Thermal Solutions 42 Thermal Mechanical Design Guide ...
Страница 50: ...Component Suppliers 50 Thermal Mechanical Design Guide ...
Страница 56: ...Mechanical Drawings 56 Thermal Mechanical Design Guide Figure B 5 1U Reference Heatsink Assembly Sheet 1 of 2 ...
Страница 57: ...Thermal Mechanical Design Guide 57 Mechanical Drawings Figure B 6 1U Reference Heatsink Assembly Sheet 2 of 2 ...
Страница 61: ...Thermal Mechanical Design Guide 61 Mechanical Drawings Figure B 10 Heatsink Compression Spring 1U 2U and Tower ...
Страница 62: ...Mechanical Drawings 62 Thermal Mechanical Design Guide Figure B 11 Heatsink Retaining Ring 1U 2U and Tower ...
Страница 63: ...Thermal Mechanical Design Guide 63 Mechanical Drawings Figure B 12 Heatsink Load Cup 1U 2U and Tower ...
Страница 78: ...Mechanical Drawings 78 Thermal Mechanical Design Guide ...
Страница 84: ...Socket Mechanical Drawings 84 Thermal Mechanical Design Guide ...
Страница 91: ...Thermal Mechanical Design Guide 91 Embedded Thermal Solutions Figure E 5 UP ATCA Heat Sink Drawing ...
Страница 98: ...Processor Installation Tool 98 Thermal Mechanical Design Guide Figure F 1 Processor Installation Tool ...
