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1.4GHz or 1.6GHz Processor, 64GB or 128GB SSD.

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Is the heat sink solid metal?

I have a MacBook Pro that operates in extreme cold temperatures and it appears that the heat sink ruptured in the cold operating climate. We've never had this problem with our original MacBook Core Duo. The heat sink looks like it is a solid bar or metal to draw the heat away to the fan. Can anyone confirm this?

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I've been into this machine but unless you cut open the heat sink I don't think I could tell what it's made of. Why do you think it ruptured, could you upload a picture. I've never heard of a heat sink rupturing.

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I would think that you are looking at a solid piece of metal, It will carry heat better than something that would be hollow/honeycomb on the inside. As for the metal, I'd go out on a limb here and suggest an aluminium alloy. "Aluminium alloys 6061 and 6063 are the more commonly used aluminium alloys, with thermal conductivity values of 166 and 201 W/m•K, respectively" from Wikipedia.

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No it will not be solid. There is a heat pipe linking the different components together. The heat pipe is filled with a liquid. Usually some form of ammonia. It draws heat away using the same principles as a refrigeration unit. You will need to replace heat sink. You can find instructions for doing that here.

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Have you got a link on this I haven't seen it.

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All modern laptops and 1u blade servers incorporate heat pipes with their heat sinks. It is a highly efficient, low profile way to transfer heat from one object to another or dissipate the heat. See more here: http://en.wikipedia.org/wiki/Heat_pipe

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Well you taught an old guy new stuff today ;-) Now here's what a 4" x 4" heat sink looks like: http://www.google.com/imgres?q=G4+MDD+he...

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Mayer that is one massive, yet pretty heat sink, 100% copper to boot. It is funny how miniaturization causes the changes in technology it does.

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