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"Just set up a passive loop with a 120.3, 6m of garden hose and a small res... took 2hrs to reach ~60CPU ~45H2O ~29Ambient at full load (running dual prime95, an mpeg convertor software and rise of nations) might still go up but then i had a breeze

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Way to hot, what happens if there are just a little bit of sun on a black radiator...
mwolfman:
as mentioned above, i will try the horizontal orientation once i get my 1 day data. I think i shd get the same sort of results as yours. Can't expect the winds to favour me all the time ya?
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Test the rad. with one fan (block the rest of the area on that side, an run it @5volt
the result should be arund 5-8 °C above amb temperature.