Intel Pentium 4 Processor on 90 nm Process Thermal and Mechanical Design Guidelines

Intel® Thermal/Mechanical Reference Design Information
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Intel
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Pentium
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4 on 90 nm Process Thermal Design Guide 39
4.1.2 Fan Performance for Active Heatsink Thermal Solution
The fan power requirement for proper operation is a maximum steady state 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 4.1.3) 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 the thermal target (Table 2) at 90% of the rated
fan RPM at 12 V.
• In addition to passing the environmental reliability tests described in Section 4.1.3, the fan
demonstrates adequate performance after 7,500 on/off cycles with each cycle specified as
3 minutes on, 2 minutes off, at a temperature of 70 °C.
4.1.3 Environmental Reliability Testing
4.1.3.1 Structural Reliability Testing
Structural reliability tests consist of unpackaged, board-level 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.
4.1.3.1.1 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