Quote:
Originally Posted by JayJay
The aluminum absorbs the heat, so where does the heat go from there? To the water. Also, the heavier/more massive the block, the more heat it conducts
* copper has a conductivity that is 70% better { 1.70 }
* aluminum has a conductivity that is 59% of the copper one {0.587 }
Thus we take 70% more aluminum and get the
* weight advantage on capacity of aluminum is down to 38% better than copper { 1.38 }
* volume advantage on capacity of copper is increased to 2.38 fold against aluminum { 2.38 }
for a unit length of equally good conduction
So when heat has to be dumped, the more the better, the quicker
the better, the results are :
If weight or cost is a concern, aluminum is favoured,
if volume is a concern, copper is better.

I am not sure where you have learned this, but it is wrong
Just examine the equation for Thermal Conductivity.
dQ/dt = kAdT/D
Thermal Conductivity is directly proportional to the surface area of the material, difference in temperature and inversely proportional to the thickness of the material.
Therefore the only ways Aluminum could have a equal thermal conductivity as copper is the following:
1. Increase the surface area of the Aluminum comming in contact with the processor, this would require a redesign of the processor to make its surface area larger....
2. Increase the constant of conductivity, this would require making the aluminum more dense, which in effect is what you are trying to say... Expect for their is no way to do this
3. Increase the temperature difference, chiller anyone?
4. Make the thickness of the aluminum smaller than that of the copper. But, why not just decrease the thinkness of the copper?
Quote:
Also, the heavier/more massive the block, the more heat it conducts

Mass is not present in this equation that has been accepted by all physicists for hundreds of years. Adding "bulk" to the system will NOT help!