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Originally Posted by Ruiner
Is a 1"square slug a real simulation of an IHS equipped core? I would highly doubt that there would be heat dispersal more than a couple of mm from the edges of the core itself, let alone homoegeneously throughout the 1" square.
IHS's are to protect the cores from poor installs, not to 'spread heat', despite their name.
I would think that the T-bird simulator is most accurate of the three he uses. Is that the consensus from the gurus here?
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Testing is always relative and the data is always subject to how well it is interpreted as well as how it is aquired. A die is a die . A 1cm die vs a 1" in. will give you relative performace rankings with a pretty good degree of accuracy., which is what most people are interested in..
Maybe a 1' in. die gives an accurate represention of an Intel IHS, the #'s are the same. But should That be the Real focus of test results? Who Knows? I do not care enough to start my own test program
The XP90 C tests as well as some good water cooled systems. But that comparison is not fair in most case because it does not have the advantage of externally mounted radiators drawing in ambient air. Case air being 5,10,15 C higher will give an application C/W 2x or 3X higher.
Testing is always relative
The XP90 has several heat pipes spread across the base - My Guess is that at 100W+ small die it will start crapping out earlier than it would if tested at the higher loads on a 1" . I think OC falls short by not testing at higher W values. Limitaions of design become more apprant at higher load levels.
Testing is always relative
Design observation
The XP90 is a clever design. The heat conducting pipes are mostly located near the tips of the mounted fan. 75% of the Fan flow is in the last 25% of the outboard fan tip. The higher speed air flow at the tip is more effective at cooling than spreading them across the radiator and increases overall airflow through the sink by decreasing the pressure drop.
Might make a good water radiator design.