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To: Mani1 who wrote (5535)	8/18/2000 1:11:45 PM
From: Ali Chen	Read Replies (1) \| Respond to of 275872

Mani, <For a coppermine, copper fins are virtually useless.> That's why Intel demonstrated their first Giga-Cumines with all-copper convoluted-fin heat sink, right? <If you put in 0.1 W power in the sink with free convection, then copper won't even help 0.01%. If you put in 1000 W and have liquid forced cooling then..> We are not talking here about free convective sinks nor about 1kW liquid cooling. Extreme cases do not stress your point. Please use relevant scales of matter - 40-50W and forced air. <For a typical sink and a fan, and power of around 30 watts, copper fins add virtually zero.> And for the same relevant range, this experimental study, with described methodology and data, obviously disagree with your unsupported statement, see again: rtcgroup.com <For a copper pin fin to provide a meaningful advantage over a power ranges of a typical CPU, the aspect ratio (length/width) of the fin needs to be very high, almost un practical.> You see the picture in reverse: the aspect ratio does not _need_ to be very high, but it _can be_ very high. Which means that the air gaps can be made bigger for the same effective surface, which means that the resistance to air flow can be smaller, which means that the same fan can provide more air flow, which means that the sink surface temperature can be lower, which means lower overall thermal resistance. And about being un-practical, people have invented fins made of copper shim. Sinks are light, and have very efficient fin "aspect ratio". For typical convoluted fin design, see: wakefield.com Regards, - Ali