so if been tring to decide what cooler to get for my proc and i was looking at the zalman 9700 LED and NT. I noticed that one was all copper and the other was copper and alu. so the question popped into my head, which is better?
Copper disapates heat better then aluminum.
Do you have a source for this info?Aluminum actually dissipates heat better. Copper conducts heat better.
Do you have a source for this info?Aluminum actually dissipates heat better. Copper conducts heat better.
Ok, lets apply some science:
It is true that copper conducts heat better, higher Cp value (as mentioned by someone else) but no-one has mentioned the specific heat capacities (SHC).
The SHC is how much energy one kilogram of substance can absorb to raise it by 1 degree.
Copper has a SHC of 0.31 KJ/Kg/K
Aluminium has a SHC of 0.91KJ/Kg/K (more than double!)
This means that for the same weight of metal Aluminium contains twice as much energy which means it can transfer more energy to the air that passes over it thus keep the processor cooler.
An ideal heatsink i would think is one that has copper nearest to the cpu to transfer the heat away quickly (copper heat pipes) but then changes to aluminium to gain highest transfer of heat to the air (big aluminium fins).
Aluminium is also less dense which means that it can have the same surface area as copper and will weigh less. Higher surface area=more heat transfer.
I think this should clarify the issue.
(I am a chemistry student at oxford university btw)
Copper pulls more heat from the source than aluminum, but aluminum dissipates heat faster than copper.
A note about the spelling of aluminIUM, which is the correct spelling. Heres something I found
"Aluminium is the IUPAC spelling and therefore the international standard"
So you annoying americans, please spell aluminium correctly in this UK (not america for those of you who dont know) forum.
A note about the spelling of aluminIUM, which is the correct spelling. Heres something I found
"Aluminium is the IUPAC spelling and therefore the international standard"
So you annoying americans, please spell aluminium correctly in this UK (not america for those of you who dont know) forum.
After two years of fin surface oxidation in a typical household environment, which would dissipate heat better for a given design?
I might add here that this particular thread has managed to significantly erode the esteem in which I hold Oxford's science programs. My old advisor went there, but she actually seemed to know her stuff.