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post #21 of 50
A drop of dish soap, problem solved.
 
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post #22 of 50
lol....yeah may help..or a proper wetting agent....but tbh considering the lengths some very talented folk will go to I'm surprised no one seems to have fabricated a graphics card vapor chamber into a waterblock....spreads heat far more effectively than conduction.
post #23 of 50
Both graphene and diamond will not react with water, and to get either to be effected by heat would probably be enough to vaporize silver.
Quote:
Originally Posted by technogiant View Post

lol....yeah may help..or a proper wetting agent....but tbh considering the lengths some very talented folk will go to I'm surprised no one seems to have fabricated a graphics card vapor chamber into a waterblock....spreads heat far more effectively than conduction.

EVGA does this, and I am sure someone on the forms has tried. I think I have heard higher end air cooling solutions use their heat pipes as vapour chambers. This trick is to have it evaporate at your idea low temperature and having a head sink that can dissipate the heat at the same rate. Would love to try this or a silver block once I get the time.
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post #24 of 50
Graphene and diamond will not react with water, but the question is because they are different in nature to water will they interact at the surface sufficiently to transfer heat. The same way as oil and water will not mix.

I'm not sure that commercial "wetter" which are surfactants would help...they help with a metal/water surface but whether they would help with a surface such as graphene/diamond which is completely opposite to water is debatable.

Heat pipes and vapor chambers are the same thing but just in a different shape, I'm aware of a couple of air coolers that use vapor chambers but would love to see a large surface area water block made with one of these.

I've a friend on another site that has built a rig using water/antifreeze mix at -30c......and while he is able to keep his gpu's at below zero all the time regardless of load his cpu will go to +30c.
Just goes to show that commercially available cpu waterblocks are not up to the job......he's trying to fabricate a larger one with a bigger surface area....similar to the bigger gpu blocks.
Edited by technogiant - 3/26/13 at 1:25am
post #25 of 50
Surfactant makes oil and water mix...

Chips reach those temperatures because the temperature is measured in the silicon, not at the heat sink. They reach those temperatures because the die is so small and there isn't enough area to transfer the heat well. This is a downside of shrinking architecture. No heat sink design will change this fact.
 
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post #26 of 50
Quote:
Originally Posted by ramicio View Post

Surfactant makes oil and water mix...

Chips reach those temperatures because the temperature is measured in the silicon, not at the heat sink. They reach those temperatures because the die is so small and there isn't enough area to transfer the heat well. This is a downside of shrinking architecture. No heat sink design will change this fact.

Surfactant doesn't exactly make them mix.........it makes the oil form an emulsion in the water....tiny droplets of oil surrounded by a shell of surfactant....so even in those circumstances the oil and water are still not directly interacting.

As regards heat density....well yeah that is a growing (or rather shrinking) problem....all the more reason for ensuring that the method of interfacing with the cpu is as efficient as possible.

I like the idea of a vapor chamber at this point in the cooling chain......would very rapidly spread the heat laterally to compensate for the surface area the chip itself is lacking. Another good material is Panasonic's "pyrolytic graphite sheet"......it not as expensive as graphene, far from it, is quite affordable.....conducts about X4 to x8 times better than copper in a lateral plane.
post #27 of 50
You could use other fluids to carry away the heat. It doesn't have to be water.

I just think the problem is all but non-existent. It only applies to people trying to milk out the last drops of their setup running cryogenic temperatures. I don't see people needing to worry about these last drops of efficiency for liquid cooling. It's not going to do anything for the real world.
 
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post #28 of 50
You may be right, but on the other hand it may have more of an affect than you think, without testing it's hard to know, and currently I completely out of both diamond and graphene water blocks....lol.

One thing is for sure if you had to swap out the liquid to use something other than water then that would give you a reduction in efficiency far beyond anything you'd gain from the diamond/graphene waterblock.

Water has a far greater specific heat capacity than anything else you'd care to mention.
post #29 of 50
Thread Starter 
Quote:
Originally Posted by technogiant View Post


Water has a far greater specific heat capacity than anything else you'd care to mention.

I've thought about running a mercury loop, but the fact that mercury reacts with most metals is a huge problem. If I diamond coated the surface of the heatsinks and found a pump that can handle mercury however...
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post #30 of 50
See then, water and metal would be the best combination.
 
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