OCZ Displays Carbon Nanotube Cooler
June 9, 2007 3:26 AM
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The OCZ Hydrajet cooler, featured upside-down to reaveal the carbon nanotube conductor. (Source DailyTech, Anh Huynh)
The OCZ Hydrojet cooler uses an advanced heatsink material
The first heatsink to make use of directional carbon nanotubes, the OCZ Hydrojet, was on display at Computex 2007. Carbon nanotubes, an allotrope of carbon, are widely regarded as the next major thermal interface material because of their superior thermal conduction properties.
The contact base of the OCZ Hydrojet is made completely of carbon-nanotubes, which OCZ claims are five times more efficient than copper. Carbon nanotubes have been looked upon as a strong alternative to traditional copper based heatsinks. They are ideal for application in heat transfer products because of their impressive heat-conduction properties. Carbon nanotube based interfaces have been shown to conduct more heat than conventional thermal interface materials at the same temperatures. In addition, they have shown to be ballistic conductors at room temperature, which means electrons can flow through CNTs without collisions.
Carbon nanotubes are small wire-like structures made out of a sheet of graphene. The sheet of graphene used to construct CNTs is roughly one-atom thick, and is rolled up into a cylinder. The diameter of the cylinder ranges in the nanometers.
Unlike most other thermal materials, carbon nanotubes are able to move heat in one direction. On the other hand, copper, which is looked upon as one of the more superior thermal materials, moves heat radially. In the case of CNTs, heat is moved along the alignment of the nanotubes.
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RE: In my understanding
6/9/2007 9:35:55 PM
Thanks for the feedback.
As it may that my understanding of the mechanics behind the limitations of air cooling are somewhat flawed, consider this:
Why is it then that the temperature of the fins on the air cooler are not the same temperature as the core?
Obviously there is a block between the heat coming out of the core, and the final destination of the core. And as to die shrinks, I was right. You were simply nitpicking (badly). If we were cooling individual transistors, than your bringing them into it would have relevance. However, as we are not, you shouldn't have. More transistors per square millimeter = more heat, albeit each individual T has a lower thermal output.
My lack of micro-processor design knowledge will start here, so forgive me and feel free to correct me-
If the CNT's are ballistic connectors ion addition to being one of the best thermal conductors around, wouldn't manufacturing the connections (wires?) inside a core allow for the pathways to functions exactly as a great conductor in addition to a heat pipe? I don't think one would preclude the other from working; the electrons are conveyed along the atoms and bonds themselves, while the heat is transmitted via conduction though the center of the tube.
RE: In my understanding
6/10/2007 12:53:14 AM
Check out a couple of articles on the design and energy usage for C.P.U's I feel that will give you a better understanding of the need for cooling within a die. Interestingly in millions of transistors there are significantly more transisters in a C2D versus a 939/AM2 however the actual Thermal output is decreased and energy usage is down this goes hand in hand with more efficient transistors even after a increase of density per mm. The idea of a more efficient cover for the CPU is intriguing and there I see a real application for the carbon nanotubes. (if heat transfer is one way they will kill the idea of peltiers :( ) Lapping is not only to remove the nickel which is a relatively poor heat conductor but also to smooth out the insane bows that are present in most CPUS AMD's and INTELS. (read anandtech for a good article on C2D imo and check out xtremesystems.org if you want to see a community for all things overclock/watercooling/lapping so on imo)
RE: In my understanding
6/10/2007 8:57:35 AM
For the first questions, that is simple, it is because the heat transferred from core - heatspreader - heatsink bottom - fins is not a perfect one thermally. That's all there is too it. However, we know that air cooling is not at its best, you just have to look at a water cooling system to know you can do better. A wc system will get better and lower temps then an air cooling system will, yet their is no change in core, heatspreader, or the likes.
as stated above, due to processor design, the Core 2 Duo actually produces less heat while having more transistors to its predecessors.
and for the next question, You are perfectly right in saying that one would not preclude the other from working, however, you really would not need that great of cooling with a CNT processor as they would withstand much higher temps without causing instability (they don't have problems with electron leakage or burnout that occurs on modern cpus when they overheat) the reason it is not used is because the manufacturing process is not there. I don't know how it is now, but just a couple of years ago CNT where some of the most expensive substance on earth, manipulating them is a fair amount different from the ability to manipulate silicon, that is why they are not used (yet) for microprocessor, but trust me, they would be far Superior to current silicon.
"Nowadays you can buy a CPU cheaper than the CPU fan." -- Unnamed AMD executive
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