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post #21 of 65
Hmm aren't we trying to move heat in one direction anyway? Transferring from the cpu to the heatsink is really just one direction, and that is a vertical inclination. So if you could have them aligned the right way wouldn't the single direction be a pro and not a con? Unless I am misunderstanding, than please educate me.
post #22 of 65
When Z says one direction, I think you mean the very narrow definition of direction as angular vector right? The definition of a sphere is an infinite number of points equidistant from a point in 3 dimensions. If you drop one graphene molecule, it can be pointed in a vector in any one of 360^2 degrees. Assume though that angle of inclusion is pretty tight for vectors to bleed to the side once the heatsink is on top of the THS.

Is that too narrow? So is Graphene like a thermal diode? Could you use LN2 to realign molecules? Perhaps a magnetic field, etc?
post #23 of 65
Quote:
Originally Posted by caveman59847 View Post

Okay so far I would have to say it is looking good. The first attempt I made I had just put a very small drop on and had reattached my Corsair H100i. When I started monitoring my temps I was sitting around 35C idle and could get to 50C during a burn in test. Well that just wasn't going to do it for me and I was not satisfied with the results. I had higher hopes that Graphene would perform much better. I then unhooked everything and cleaned it off real good and this time applied substantially more Graphene onto the CPU. It was a little difficult to spread out as it wanted to pool onto the card that I was trying to use to spread it but with some finagling I was happy with how it turned out. I put the CPU Cooler back on and started to monitor my temps with Asus PC Probe and SpeedFan and Corsair Link. When the Computer is idle I am at 24c to 25c and when I am using Prime 95 it will go to about 40 to 43c at best but would top off and would not get any higher.

Have you tried the high five method? (4 smaller dots, 1 in the center and 1 towards/at each corner.
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post #24 of 65
I looked up my CC because I could not remember where exactly I bought it but from the information I had I went to Graphene.ws. I believe I payed $45 dollars for 4 tubes of it. I actually bought way more than I needed but did so i could explore possible other uses for Graphene.
post #25 of 65
hhhmmm, i wonder if this could drop my GPU temps even 5c on my laptop.
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post #26 of 65
So do you just get it off their site? I saw some on eBay for 7$ plus shipping.

tappin from the Note II
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post #27 of 65
Quote:
Originally Posted by 8800GT View Post

Hmm aren't we trying to move heat in one direction anyway? Transferring from the cpu to the heatsink is really just one direction, and that is a vertical inclination. So if you could have them aligned the right way wouldn't the single direction be a pro and not a con? Unless I am misunderstanding, than please educate me.

Well, you're assuming the single direction the graphene is moving is from the IHS to the heatsink. The problem with graphene nanopowders is they have a ridiculous amount of small grains, and each grain moves heat in a single direction. So in imagine it like this analogy. You have a bunch of little spheres, and each sphere has a pump in it. It takes in water from one side, and moves it to the exact opposite side. Now take all these spheres and toss them in a tub, making sure they all land in a completely random orientation. Now mount the spheres so all of them remain stable. When you turn on the pumps it will be moving heat in every which way, when all you really want to do is move heat up. Obviously comparing thermodynamics of solids to fluid dynamics of liquids can in no way give you entirely accurate predictions, but none the less it's a good analogy to understand the way graphene nanopowders move heat.
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post #28 of 65
Quote:
Originally Posted by SynchronicBoost View Post

When Z says one direction, I think you mean the very narrow definition of direction as angular vector right? The definition of a sphere is an infinite number of points equidistant from a point in 3 dimensions. If you drop one graphene molecule, it can be pointed in a vector in any one of 360^2 degrees. Assume though that angle of inclusion is pretty tight for vectors to bleed to the side once the heatsink is on top of the THS.

Is that too narrow? So is Graphene like a thermal diode? Could you use LN2 to realign molecules? Perhaps a magnetic field, etc?

technogiant explained it better than I could have
Quote:
Originally Posted by technogiant View Post

I guess you almost answered the question there....if graphene is 10X greater than copper then in a random orientation I suppose the worst case scenario would be that the 50% of the particles would have the wrong orientation and so drop it to 5X that of copper.

My other concern is that the pressure squeezing the the heatsink onto the cpu in a thin layer may force the orientation of the graphene particles into a more lateral and unfavorable orientation.

I suppose it all depends on the shape of the graphene particles.....if they are small flat plates as we appear to be assuming then this would be a consideration....but it may be that the graphene is in the form of "Buckyball" graphene spheres which I guess would transfer heat in all directions equally.

I've been enquiring about panasonic pyrolitic graphite sheet and had some information back which may be of relevance to this..... the lateral plane it has a thermal conductivity of 1700 w/mk while in the perpendicular plane it is only 10 w/mk......so a considerable difference.
(on a side note, Graphene can have a thermal conductivity of up to 2300w/mk according to some sources. It really depends on the purity of the test sample.


File source: http://commons.wikimedia.org/wiki/File:Graphen.jpg

This is what graphenes molecular design looks like, perhaps it will make it easier to understand, for anybody who doesn't get the "heat moving in a single direction" concept.




caveman59847 already has confirmed it has MUCH better results than normal thermal paste, however I'm curious to see how it stands up to top end TIMs like Indigo Extreme, or other liquid metal TIMs
Edited by ZytheEKS - 5/23/13 at 4:31pm
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post #29 of 65
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post #30 of 65
Both of you guys make a valid point. I bought 2 Indigo Extreme about three months ago and when I did get it to work it cooled very well. Not to take away from Indigo Extreme but the first time I used one I must not have completed the burn in correctly because I didn't get very good results and the second time i was able to get good results but after a month of use I burned out the AMD Phenom II x4 965 Black Edition Processor I was using. I ended up spending about $300 to replace the mobo and the processor and RMA'd the Corsair H100i I used. I finally bought a AMD Phenom II x6 1100T and was able to get it to working conditions. I wouldn't want anyone to shy away from trying the Indigo Extreme as maybe it was bad luck on my part and I guess sometimes thats what happens when experimenting with things and I am willing to accept that. The site graphene.ws actually has Graphene thermal paste and I understand it is becoming more readily available however there is also Graphene powder but I think I would just rather buy the paste as I am not a chemist and wouldn't want to mix it to apply to my CPU and finding a reputable seller of it as it becomes more poplar I'm sure their will be Companies selling less reliable products but I have been known to be a bit of a cynic at times
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