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Originally Posted by wasserkool
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It appears you are running both pumps in series. As these are not "matched" for flow rate I'm not sure this is such a great idea (the lesser pump will simply provide resistance).
Also - I think your passive rad preformance will vary based on the orientation of the rad. You should get better performance with the rad oriented so that air can flow upwards through the fins - or maybe downwards and in the winter with the rad below a Canadian-cold window
) If you want better performance, but still no fan, try putting a "chimney" on the upwards side of your rad. It doesn't have to be strong - construction paper and tape should work fine. BTW, this was a common mod for early Macs, which ran a bit hot and had no fan.
However... even with active cooling and
huge fan(s) to push/pull air through your rad, it will, of course, never get below ambient