Re: Cooling Metalplate for Powerlogix 500 mhz?

[Krevnik]

You actually need something that conducts heat well, not metal that 
stays cool. Steel doesn't conduct heat very well if I remember 
correctly, so it isn't the best idea. Aluminum seems to be used in the 
heatsink plates in the Lombard and Pismo, but copper is a very good 
heat conductor. A lot of heatsinks you can buy for PCs these days use 
copper as the material as there is a lot of heat needing to be 
dissipated. Since you have to build one yourself, I would use copper.

On the thickness, that doesn't apply nearly as much as the surface area 
ratio (the amount of surface area on the chip versus the surface area 
of the rest of the plate in contact with the Keyboard/etc). Try to 
build one that can cover the entire chip if possible, and have as much 
contact with the chip as possible. Then make it come in contact with 
the existing heatsink plate with as much surface area as reasonable. 
This will ensure that heat transfer from the chip to the rest of the 
system goes smoothly.

On Dec 22, 2003, at 10:42 PM, Mikael Byström wrote:

I need suggestions on what material and thickness the cooling 
metalplate
that is supposed to be on top of the 500 mhz G3 Powerlogiz Blue chip 
for
the Powerbook Wallstreet model ( I have a rev. 2), should be. I just
bought one second hand and it seems to be missing from the package and 
I
have to make my own. I have access to a toolshop, so it shouldn't be a
problem, but I could use some info if you have one or have knowledge of
how the real thing is supposed to look .

Steel comes to mind as being the most "cool" metal I know of. Is that a
good material or should I use something like brass or some other 
material
instead? I'm contemplating 2-4 mm thickness, but if you guys have any
real info, I'd be glad to hear about it.

Mikael



"Any sufficiently advanced technology is indistinguishable from magic."
Arthur C. Clarke


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