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Originally Posted by bigben2k
Copper has a better thermal conductivity (do you really want the numbers? I didn't think so! ) but also has a (relatively) high thermal capacity.
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Aluminium's specific heat capacity is almost 2.5 times greater than copper's actually. Specific heat capacity is largely irrelevant in a steady-state system such as water cooling in any event.
Oh BTW, 6063 is a better alloy for making blocks than 6061 (higher thermal conductivity). If you can get hold of it, 1050 or 1350 is even better.