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Huh? Copper or Aluminum? - Page 4

post #31 of 42
Quote:
Heat is conducted in metals, according to current theory, by lattice waves,
phonons, and free (or valence) electrons. In a non-metal, heat is
conducted only by phonons. (A phonon is equivalent to one quantum of
energy in the form of a thermoelastic wave of fixed frequency. In this
sense, a phonon is analogous to the concept of a photon in electromagnetic
radiation theory.) Because there are three methods of heat transport in
metals, compared with only one in non-metals, one would expect that metals
would be better conductors of heat than non-metals.
The transport of heat through a metal is affected by the structure of the
metal. A single pure crystal of metal will conduct heat much better than a
large number of very small crystals because of scattering of the phonons at
the crystal boundaries. Likewise, if you alloy a metal, the differences in
sizes of metal atoms will cause a large decrease in thermal conductivity.
Mechanical damage to a metal structure by cold working or radiation will
also decrease the conductivity of the metal.
Based upon these considerations, pure copper and silver have the highest
thermal conductivity of the metals. In 1923, a German named Schott
measured the thermal conductivity of a single crystal of copper at 12,200
Watts per meter Kelvin (W/mK) at a temperature of 20.8 K. However, at room
temperature, commercially pure copper typically has a conductivity of about
387 W/mK.
The material with the highest thermal conductivity is the most pure, single
crystal form of carbon, which we call a diamond. When you want to verify
if a diamond is real or not, thermal conductivity is an infallible method.
The thermal conductivity of diamonds is around 1200 W/mK. As a result,
there is interest in learning how to grow diamond films thick enough and
cheaply enough to allow them to be used for thermal management. Other
materials with high conductivity are certain other forms of carbon, such as
high purity graphite fibers and pyrolytic graphite. As you might expect,
both have very high chemical purity and large crystalline structures.
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post #32 of 42
Quote:
Originally Posted by MADMAX22 View Post
I think diamond is better then that still but I dont know what its abilities are.
Diamond isn't better at conducting heat due to the way it bonds on a molecular level, but it's surely a tad more expensive. The reason people say that it's better is due to confusion of (W/mK) which is not a good indication of diamonds ability in this regard.

There are things superior to copper and silver though, synthetic carbons for example. A few companies have utilized this in prototypes but never made it to the manufacturing line due to costs and difficulty in processing involved.
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post #33 of 42
Carbon nano-tubes were being utilized for cooling prototypes at some vendor booths at CES this year.
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post #34 of 42
Quote:
Originally Posted by dpawl31 View Post
Ever tried to make fins as thin as a CPU heatsink, out of pure copper?
Not gonna happen. lol. Too soft.
Very thin aluminum is still decently rigid. =D
Copper fins are made for hostile environment applications (such as a salt company) for air conditioners where aluminum wouldn`t last a month.
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post #35 of 42
Quote:
Originally Posted by Znth View Post
incorrect, copper is superior all around but is much more expensive to use hence why they try to use copper in the most important parts and then aluminium for other areas to save money.

However there is some improvement to be had with staying with the same metal, going from copper to aluminium diminishes heat transfer even though copper is a better thermal material, if the CPU heatsink was aluminium you can see how this would be an advantage.
Yup, copper is heavier too. They can get anyway with putting the light Al on the end of the heatsink and have a TON of it, so the surface area of it makes up for the 1/3 amount of heat conduction as the copper.
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post #36 of 42
A solid copper Tuniq Tower... my god that would be pricey... But methinks it'd be worth it?

Quote:
Originally Posted by hvacgaspiping View Post
Copper fins are made for hostile environment applications (such as a salt company) for air conditioners where aluminum wouldn`t last a month.
I thought pure copper was bad for that kind of situation, doesn't it corrode or something?
    
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post #37 of 42
Quote:
Originally Posted by dpawl31 View Post
A solid copper Tuniq Tower... my god that would be pricey... But methinks it'd be worth it?
Maybe. Probably not though. Since the surface area of the fins is already so great, you are going about as low as you can go to ambient. Not to mention a solid copper heatsink of that size would rip your board in too. Instead of 800g think 4,000.

Quote:
Originally Posted by dpawl31 View Post
I thought pure copper was bad for that kind of situation, doesn't it corrode or something?
Common sense would say you are right, and I agree with you on it.
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post #38 of 42
Quote:
Originally Posted by LiNERROR View Post
and i use my edit button often...

but those posts where in response to different posts...
That's still an occasion where you'd use the edit button

There's the "+ button on the right of the quote button...you can respond to multiple quotes taht way....or you can copy and paste the quote info into your edit...whatever yo uwish....

Just buy a Tuniq Tower already...I'm tellin ya it's the best even without bein all copper.
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post #39 of 42
Quote:
Originally Posted by Sideburns View Post
Just buy a Tuniq Tower already...I'm tellin ya it's the best even without bein all copper.
Whats the best is debatable and will change with each person.
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post #40 of 42
Quote:
Originally Posted by Mootsfox View Post
Whats the best is debatable and will change with each person.
Actually what's the best can be proven, and facts are not debatable.

For example it's a fact that in all the major benchmarks the thermalright ultra 120 extreme runs cooler than the tuniq so on performance it is better.
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