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The thermal/mechanical solution for the boxed Pentium® 4 processor in the
478-pin package is designed to place a compressive load on the CPU package and
socket. It is normal to observe a bow or bend in the board.
The thermal and mechanical retention solution for the boxed Pentium 4 processor
in 478-pin package does not require direct attachment to the chassis, unlike
the 423-pin package. This solution can be mounted entirely from the topside
of the board, and has no specific tool requirements. This enables the processor/desktop
board combination to be chassis-independent, although proper thermal validation
should be provided, as always.
The boxed Pentium 4 processor should be installed
after the desktop board has been secured in the chassis. By using the motherboard's
rigidity to its advantage, the thermal/mechanical solution is designed to provide
structural robustness to ensure mechanical and electrical integrity of the desktop
board during shock and vibration events. It does this by placing a compressive
pre-load on the CPU package and socket. Heatsink provided with boxed Pentium
4 processors are designed for use only with the clip included with this solution,
other available clip and heatsink designs are not necessarily interchangeable.
This applies to:
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