Intel Pentium 4 Processor with 512-KB L2 Cache on 0.13 Micron Process Thermal Design Guidelines

Intel Thermal Mechanical Reference Design Information
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Intel
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Pentium
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4 Processor Thermal Design Guide 43
4.1.4 Fan Performance for Active Heatsink Thermal Solution
The fan power requirement for proper operation is a maximum current of 740 mA at 12 V.
In addition to comply with overall thermal requirements (Section 4.1.1), and the general
environmental reliability requirements (Section 4.1.5) the fan should meet the following
performance requirements:
• The expected fan minimum functional lifetime is 40,000 hours at 45 °C.
• The thermal solution is capable of meeting end-of-line performance for frequencies at
3.06 GHz or higher at 100% of the rated fan RPM at 12 V. End-of-life fan component
reliability can also be evaluated by de-rating the fan RPM @ 12 V by 90%.
• In addition to withstanding the environmental reliability tests described in Section 4.1.5, the
fan still demonstrates performance after 7,500 on/off cycles with each cycle specified as
3 minutes on, 2 minutes off, at a temperature of 70 °C.
4.1.5 Environmental Reliability Testing
4.1.5.1 Structural Reliability Testing
Structural reliability tests consist of unpackaged, board-level mechanical vibration and shock tests
of a given thermal solution in assembled state, as well as long-term reliability testing (temperature
cycling, bake test). The thermal solution should be capable of sustaining thermal performance after
these tests are conducted; however, the conditions of the tests outlined here may differ from your
own system requirements.
4.1.5.2 Random Vibration Test Procedure
Duration: 10 min/axis, 3 axes
Frequency Range: 5 Hz to 500 Hz
Power Spectral Density (PSD) Profile: 3.13 g RMS