64-bit Intel Xeon Processor with 2MB L2 Cache Thermal/Mechanical Design Guidelines

64-bit Intel® Xeon™ Processor with 2MB L2 Cache Thermal/Mechanical Design Guidelines 29
Thermal/Mechanical Reference Design
2.4.6 Thermal Profile Adherence
The 2U+ CEK Intel reference thermal solution is designed to meet the Thermal Profile A for the
64-bit Intel Xeon Processor with 2MB L2 Cache. From Table 2-2, the three-sigma (mean+3sigma)
performance of the thermal solution is computed to be 0.293 °C/W and the processor local ambient
temperature (T
LA
) for this thermal solution is 40 °C. Hence, the Thermal Profile equation for this
thermal solution is calculated as:
Equation 2-8. y = 0.293x + 40
where,
y = Processor T
CASE
value (°C)
x = Processor power value (W)
Figure 2-11below shows the comparison of this reference thermal solution’s Thermal Profile to the
64-bit Intel Xeon Processor with 2MB L2 Cache Thermal Profile A specification. The 2U+ CEK
solution meets the Thermal Profile A with a 2.1
o
C margin at the lower end (Pcontrol_base_A) and
a 0.7
o
C margin at the upper end (TDP). By designing to Thermal Profile A, it is ensured that no
measurable performance loss due to TCC activation is observed under the given environmental
conditions.
Figure 2-10. 1U CEK Heatsink Thermal Performance