Required Yca For Various Tambient Conditions; Boundary Condition Definition - Intel BX80605X3440 - Quad Core Xeon X3440 Reference

Sensor Based Thermal Specification Design Guidance
7.3.1

Boundary Condition Definition

Using the knowledge of the system boundary conditions such as inlet air temperature,
acoustic requirements, cost, design for manufacturing, package and socket mechanical
specifications and chassis environmental test limits the designer can make informed
thermal solution design decisions.
For the Intel
for a 1U Server system are as follows:
• T
EXTERNAL
• T
RISE
• T
AMBIENT
Based on the system boundary conditions the designe r can select a T
use in thermal modelling. The assumption of a T
required Ψ
assumed T
Figure 7-3
3400 series (95W).
Note: If the assumed T
thermal solution performance may not be sufficient to meet the product requirements.
The results may be excessive noise from fans having to operate at a speed higher than
intended. In the worst case this can lead to performance loss with excessive activation
of the Thermal Control Circuit (TCC).
Figure 7-3. Required Ψ
80.0
70.0
60.0
50.0
40.0
30.0
20.0
10.0
0.0
Note: If an ambient of greater than 45.1 °C is necessary based on the boundary conditions a
thermal solution with a Ψ
Thermal/Mechanical Specifications and Design Guidelines
® ®
Xeon processor 3400 series (95W), the thermal boundary conditions
= 35 °C. This is typical of a maximum system operating environment
= 5 °C
= 40 °C (T = T
AMBIENT
needed to meet TTV T
CA
can utilize a design with a higher Ψ
AMBIENT
shows a number of satisfactory solutions for the Intel
is inappropriate for the intended system environment, the
AMBIENT
for Various T
CA AMBIENT
Ψ-ca = 0.45
Ta = 30 °C
0 20
lower than 0.29 °C/W will be required.
CA
+ T )
EXTERNAL RISE
has a significant impact on the
AMBIENT
at TDP. A system that can deliver lower
CASEMAX
, which can have a lower cost.
CA
Conditions
Ψ-ca = 0.40 Ψ-ca = 0.34
Ta = 35 °C Ta = 40 °C
40 60
TTV Power Dissipation (W)
and Ψ to
AMBIENT CA
® ®
Xeon processor
Ψ-ca = 0.29
Ta = 45.1 °C
80
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