Thermal Solutions
Intel
®
Xeon
®
Processor C5500/C3500 Series and LGA1366 Socket
Thermal/Mechanical Design Guide
August 2010
61
Order Number: 323107-002US
7.5.3
Power Thermal Utility
The Intel
®
Xeon
®
processor C5500/C3500 series
Power Thermal Utility allows power
and thermal testing of the processor.
The Utility will allow power and thermal testing of the processor. The thermal solution
must be designed to keep the processor Tcase within specification for the Thermal
Design Power (TDP) as specified in
. Contact your Intel representative to
obtain the latest revision of the PTU.
The default power level from the drop down list represents TDP.
7.6
Thermal Features
More information regarding processor thermal features is contained in the appropriate
Datasheet.
7.6.1
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 with ambient
temperature can improve acoustics when DTS > TCONTROL.
7.6.1.1
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
appropriate
Electrical, Mechanical, and Thermal Specifications (EMTS)
for more
information.
Table 7-2.
Fan Speed Control, T
CONTROL
and DTS Relationship
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).