Mechanical Enabling for the Intel Pentium 4 Processor in the 478-Pin Package

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Design Effectiveness
Intel
®
845 MCH Clip Design
 Clip design tailored to achieve target stiffness of 300 lb/in
 Mechanical advantage levers used to generate 36 lb preload
 Performance under shock load (+z):
 Local board flexure is reduced
 Solder ball load prevents from excessive tensile loads, and provides protection
to MCH solder joint.
Clip stiffness =
300 lb/in
Mechanical advantage
lever generates preload