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Introduction
10 Thermal/Mechanical Specifications and Design Guidelines
1.1 References
Material and concepts available in the following documents may be beneficial when
reading this document.
1.2 Definition of Terms
Table 1-1. Reference Documents
Document Location Notes
Intel® Xeon® Processor E3-1200 Family Data Sheet Volume One http://
www.intel.com/
Assets/PDF/
datasheet/
324970.pdf
Intel® Xeon® Processor E3-1200 Family Datasheet Volume Two http://
www.intel.com/
Assets/PDF/
datasheet/
324971.pdf
Intel® Xeon® Processor E3-1200 Family Specification Update http://
www.intel.com/
Assets/PDF/
specupdate/
324972.pdf
4-Wire Pulse Width Modulation (PWM) Controlled Fans
Available at http://
www.formfactors.org/
Table 1-2. Terms and Descriptions (Sheet 1 of 2)
Term Description
Bypass Bypass is the area between a passive heatsink and any object that can act to form a duct. For this
example, it can be expressed as a dimension away from the outside dimension of the fins to the nearest
surface.
CTE Coefficient of Thermal Expansion. The relative rate a material expands during a thermal event.
DTS Digital Thermal Sensor reports a relative die temperature as an offset from TCC activation temperature.
FSC Fan Speed Control
IHS Integrated Heat Spreader: a component of the processor package used to enhance the thermal
performance of the package. Component thermal solutions interface with the processor at the IHS surface.
ILM Independent Loading Mechanism provides the force needed to seat the 1155-LGA land package onto the
socket contacts.
PCH Platform Controller Hub. The PCH is connected to the processor via the Direct Media Interface (DMI) and
Intel
®
Flexible Display Interface (Intel
®
FDI).
LGA1155 socket The processor mates with the system board through this surface mount, 1155-land socket.
PECI The Platform Environment Control Interface (PECI) is a one-wire interface that provides a communication
channel between Intel processor and chipset components to external monitoring devices.
Ψ
CA
Case-to-ambient thermal characterization parameter (psi). A measure of thermal solution performance
using total package power. Defined as (T
CASE
– T
LA
) / Total Package Power. The heat source should always
be specified for Ψ measurements.
Ψ
CS
Case-to-sink thermal characterization parameter. A measure of thermal interface material performance
using total package power. Defined as (T
CASE
– T
S
) / Total Package Power.
Ψ
SA
Sink-to-ambient thermal characterization parameter. A measure of heatsink thermal performance using
total package power. Defined as (T
S
– T
LA
) / Total Package Power.
T
CASE
or
T
C
The case temperature of the processor, measured at the geometric center of the topside of the TTV IHS.