What does pressure have to do with it?

I was reading the 5 way review of 5 different heatsinks:
<A HREF="http:// http://www.virtual-hideout.net/articles/socketa_hsf/index.shtml " target="_new">http:// http://www.virtual-hideout.net/articles/socketa_hsf/index.shtml </A>
i was wondering about something that was said in there...
about how a heatsink having a weak clip would cause less thermal transfer...along those lines..
now that doesnt really make sense to me, since if it is strong enough to hold the heatsink flush with the core, then if it was pushing any harder on the core, wouldnt you be risking crushing it? i dont see how it being on there harder would help with the heat transfer....
anyone know anything about this?
i am just asking this...for my own personal knowledge...

-DAvid

-Live, Learn, then build your own computer!-
4 answers Last reply
More about what pressure
  1. Aditional pressure helps close the microscopic cracks that even paste can't perfectly fill.

    Back to you Tom...
  2. what does it do, squeeze the metal into the microscopic gaps?
    i thought about it, and i think that if there is less thermal grease, and pressure pushes it out, then there would be even better heat transfer, right?
    so therefore, the thermal interface material would only be doing a fraction of the work, instead of like half of it (theoretical, not actual ammount of work that the thermal grease does, hehe)
    because i think that direct metal contact would be better than having some grease in between the metal and the core.
    i mean, the grease can help fill in the gaps, but with minimal grease, wouldnt it work better?

    -DAvid

    -Live, Learn, then build your own computer!-
  3. I thelps sqeeze the interface material into the gaps, flatten the ridges on the gaps, and yes, reduce the thickness of the interface material.

    Back to you Tom...
  4. sweet....
    thanks for letting me know about that!

    -DAvid

    -Live, Learn, then build your own computer!-
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