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Message: <blockquote data-quote="dolly" data-source="post: 177612" data-attributes="member: 1372">danny, main cooling effect here is forced convection, and the main property in motion here is conduction, copper is nearly 2x better than aluminium. copper wins.copper dissipates AND absorbs better than aluminium. why? thermal conductivity! ppl say aluminium dissipates better than copper why? like i said copper more dense = stores more energy (assuming same volume for both metals). if you were to say "well okay how about 1lb vs 1lb copper vs aluminium?" now think, how much more surface area would aluminium have over copper now? so long story short you notice, hey aluminium is cooler than copper after 10 secs, and you conclude aluminium dissipates faster. Wrong :(you show me that review and i ask you then, what is the accuracy/precision/consistency of their thermal probes?did you know that multiple installations of heatsinks can lead to a significant difference in temperature change? thermal paste application consistency??also your example is a poor one, go back to specifications page... now take a look at the surface area the alx has over slk? also notice "super thin aluminium fins for maximised dissipation" that and in itself is not an apples to apples comparison. Thin aluminium fins means a smaller thermal resistance to air, of course then, if you compared a thicker fin, but better conduction, it could go either way. but by making thinner fins, you increase SURFACE AREA thus allowing more conduction of heati hear this all n all the time in this forum that forum etc etc. MYTH. forced convection = conduction. much like electrical properties. think voltage as thermal difference, thermal resistance as impedance. all in series. think of all the little effects that add up as inductance/capacitance etc that adds/subtracts to impedance and viola a good analogy.infact when doing calculations for thermal resistance/exepcted temperature at one layer or the other, the method of calculation is very similar to using v=ir - of course in a situation where forced convection is the major player. hehe sorry about sidetracking alot jinkl</blockquote>

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