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LGA775 Socket Heatsink Loading—Intel
Dual-Core E2160 Processor
A.2.5.1
Motherboard Stiffening Considerations
To protect LGA775 socket solder joint, designers need to drive their mechanical design
to:
• Allow downward board deflection to put the socket balls in a desirable force state to
protect against fatigue failure of socket solder joint (refer to sections A.2.1, A.2.2
and A.2.3.
• Prevent board upward bending during mechanical shock event.
• Define load paths that keep the dynamic load applied to the package within
specifications published in the processor datasheet.
Limiting board deflection may be appropriate in some situations like:
• Board bending during shock
• Board creep with high heatsink preload
However, the load required to meet the board deflection recommendation (refer to
Section
A.2.3) with a very stiff board may lead to heatsink preloads exceeding package
maximum load specification. For example, such a situation may occur when using a
backing plate that is flush with the board in the socket area, and prevents the board to
bend underneath the socket.
A.3
Heatsink Selection Guidelines
Evaluate carefully heatsinks coming with motherboard stiffening devices (like backing
plates), and conduct board deflection assessments based on the board deflection
metric.
Solutions derived from the reference design comply with the reference heatsink
preload, for example:
• the Boxed processor
• The Intel RCFH-4 reference design available from licensed suppliers (refer to
Appendix E
Intel will collaborate with vendors participating in its third party test house program to
evaluate third party solutions. Vendor information will be available after product
launch.
October 2007
Order Number: 315279 - 003US
®
TM
Core
2 Duo E6400, E4300, and Intel
for contact information)
®
TM
Intel
Core
2 Duo E6400, E4300, and Intel
®
®
Pentium
®
®
Pentium
Dual-Core E2160 Processor
TDG
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