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The thermal/mechanical solution for the boxed Pentium® 4 processor in 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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