Bill,
Just 're-noticed' this comment from your
Waterblock Bench Testing Results article.
Quote:
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The decrease in "C/W" as the coolant inlet temperature increases above the ambient temperature of 26°C is largely due to the increased convection from the wb body as more of the applied heat goes to the ambient. This accounts for the T/W change as well. While a change is also apparent to the TIM joint's C/W, the reasons for such are not now known.
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Die flattening with increased temperature reduces the thermal resistance of the TIM joint?