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Originally Posted by Cathar
.... which includes air-cooled heatsinks, having a significantly lower effective value for h than ~20K.
IMO, theoretically the IHS only helps those with aluminium based heatsinks, or for those heatsinks that use a way-too-thin amount of copper material between the core and the fins. In practise, I have not seen anyone report higher temperatures with the IHS removed.
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Don't entirely agree.
"
heff is the effective heat transfer coefficient acting on the surface" be it die, HS baseplate,or IHS.
For a given HS these 3 will have different values.
Certainly h(bp eff) may be < 20k, and possibly h(IHS eff) may be. However h(die eff) will be above to give a TIMless C/W below 0.5( 1cm sq die)