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Originally Posted by bigben2k
We all know that the contact surface is not perfectly flat, microscopically.
I can imagine some residue left from whatever process was used to manufacture heatsink/waterblock interfering with performance.
Bill recomends cleaning between test runs using xylene.
Otherwise, this fellow appears to have used a good thermal paste, and we (here) all know how much of an impact the TIM joint has.
Possible.
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Copper will also "absorb" things. One of the problems with casting copper blocks as they can leak. I belive TIM will absorb into the copper a little. But will that turn into a clear liquid and then smoke? Easy experiement if someone has a heatsink laying about. I think I got some somewhere will look into it a bit later.