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Originally Posted by pHaestus
wait wait. Why would the change in ambient temperature affect the difference between CPU diode and water so dramatically? You think if you raised room temp 3C that CPU temperature would stay the same?
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Agreed -sorry, yes the dT between CPU or die and water won't change with small changes in ambient.
After thinking about this some more it struck me, YOU answered this question with your initial post and concern about the large die size generating apparently lower temps. So - the dT between the XP-2400 and water temp is higher (~8C) than the dT between the thermal die and water (4~5C) because the die has more than 10x the surface area than the XP core. For the same heat generation (say ~60 watts) the smaller XP core will run hotter than the much larger copper die.