Re: Cooling Metalplate for Powerlogix 500 mhz?

[Paul Nicholson]

Make it out of aluminum. You want a material with a low thermal 
resistance. Copper is even better. You want the piece to mate with the 
heat generating surface on the CPU and the heat absorbing surfaces of 
the computer frame. The thicker the metal and the more material that 
touches the CPU and frame the better. Copper has an even better thermal 
conductivity, but is both heavier and more expensive. Steel is a poor 
heat conductor relative to copper and aluminum.

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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