Intel Core2 Duo Desktop Processor, Intel Pentium Processor, and Intel Pentium 4 Processor 6x1 Sequence

ATX Thermal/Mechanical Design Information
56 Thermal and Mechanical Design Guidelines
In addition to comply with overall thermal requirements (Section 6.1.1), and the
general environmental reliability requirements (Section 6.2) the fan should meet the
following performance requirements:
• Mechanical wear out represents the highest risk reliability parameter for fans. The
capability of the functional mechanical elements (ball bearing, shaft, and tower
assembly) must be demonstrated to a minimum useful lifetime of 50,000 hours.
• In addition to passing the environmental reliability tests described in Section
6.2,
the fan must demonstrate 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.
See the Fan Specification for 4-wire PWM Controlled Fans for additional details on the
fan specification.
6.2 Environmental Reliability Testing
6.2.1 Structural Reliability Testing
Structural reliability tests consist of unpackaged, board-level vibration and shock tests
of a given thermal solution in the assembled state. The thermal solution should meet
the specified thermal performance targets after these tests are conducted; however,
the test conditions outlined here may differ from your own system requirements.
6.2.1.1 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