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Embedded Thermal Solutions
Figure E-2.
NEBS Thermal Profile
\
90
80
70
60
50
40
Notes:
1.) The thermal specifications shown in this graph are for reference only. See the Intel® Xeon® Processor 5500
Series Datasheet, Volume 1 for the Thermal Profile specifications. In case of conflict, the data in the datasheet
supersedes any data in this figure.
2.) The Nominal Thermal Profile must be used for all normal operating conditions, or for products that do not
require NEBS Level 3 compliance.
3.) The Short-Term Thermal Profile may only be used for short-term excursions to higher ambient operating
temperatures, not to exceed 360 hours per year as compliant with NEBS Level 3.
4.) Implementation of either thermal profile should result in virtually no TCC activation.
5.) Utilization of a thermal solution that exceeds the Short-Term Thermal Profile, or which operates at the Short-
Term Thermal Profile for a duration longer than the limits specified in Note 3 above, do not meet the processor
thermal specifications and may result in permanent damage to the processor.
E.2.2
Custom Heat Sinks For UP ATCA
The Embedded specific 60W SKU is targeted for NEBS compliant 1U+ systems and UP
ATCA configurations with custom thermal solutions. In order to cool this part in a single
wide ATCA slot, a custom thermal solution will be required. Since solutions like this will
be very configuration specific, this heat sink was not fully designed with retention and
keep-out definitions.
In order to cool the additional power of a 60W processor in ATCA, the heat sink volume
was increased. The assumption was that the heat sink could not grow wider because of
VR and Memory placement, so a Remote Heat Exchanger (RHE) was used. The RHE is
attached to the main heat sink with a heat pipe. The RHE gives additional convective
surface area and gives the thermal solution access to more air. Samples of the
following design were ordered and tested for thermal performance only.
Flotherm analysis shows that the following design can cool an LGA1366 TTV in an ATCA
blade at 30CFM. The heat sink Ψca would be 0.50C/W at 55C ambient which falls below
the thermal profile for the 60W processor.
Thermal/Mechanical Design Guide
Thermal Profile
Short-term Thermal Profile may only be used for short term
excursions to higher ambient temperatures, not to exceed 360
hours per year
Short-Term Thermal Profile
Tc = 0.302 * P + 66.9
0
5
10
15
20
Nominal Thermal Profile
Tc = 0.302* P + 51.9
25
30
35
40
45
Power [W]
50
55
60
89
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