D.I.Y Copper Base On Aluminum Heatsink Experiment
Are we talking betwteen the die and the IHS or IHS and cooler? In any case:
10 minutes ago, TeraBitz said:But still the aluminum would only pick up heat the same as if it were on the CPU.
I think you've answered your own question. No matter how conductive the stuff between is, ultimately you'll be limited to the conductivity of the worst conductor. Adding a sheet of copper sandwiched between some pastes only adds more layers the heat has to travel through before reaching the cooler and I don't think such a tiny sliver of copper has enough thermal mass to act as a buffer.
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That's why people go for liquid metal. It has a higher thermal conductivity than thermal pastes. If your copper solution has better transfer than thermal paste it may work, but if you're just going to stick normal thermal paste in between I don't think it will.
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[Edit] Also judging from this thread and the fact it's a sealant it's not meant to come off and will basically glue things together. Might want to try this on an old system you don't need to reuse
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