I do not know about AMD notebook. I do not those so called
Centrino has heat problem. Maybe because it is a Dell (600M),
my notebook suffered a sudden death just before one year
warranty. It was okay when I used it in US (not so hot).
But it only worked for two months in tropical Singapore
(hot and high humidity). I had to ship it back to USA for 
repair since it did not have international warranty. :( 
Now it has been working for another year but I always 
remember to switch on the air conditioner.

Xiaofan

-----Original Message-----
From: Peter [mailto:plp@actcom.co.il]
Sent: Thursday, May 19, 2005 2:13 AM
To: Microcontroller discussion list - Public.
Subject: Re: [EE]: 2006 games consoles to outperform desktop pcs ?

I don't know about Centrino but AMD powered laptops do have a heat 
problem (or had one) and they use the heat pipe technology to get rid of 
it. The heat pipe technology is able to move really huge amounts of 
heat. Essentially it boils a liquid on the cpu and the vapor condenses 
on the cooler part. The heat capacity is huge and the hot part will 
never exceed the boiling temperature of the liquid until heat input 
overcomes the capacity of the device.

Hmm, how much *vacuum* is needed to use *water* as refrigerent and boil 
it at ~50C ? (answer: 100mm Hg or about 1/8 at - achievable with a 'van 
Guericke' pump (aka bicycle pump with reversed diaphragm and valve)). 
Plastic tubing has no trouble withstanding 100 mm Hg (I tried this). 
Someone will eventually try this out ;-)

Peter

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