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FAQ: Why colder is better

post #1 of 4
Thread Starter 
As most of you know colder temperature, especially extreme cold, is very beneficial for overclocking. I am now going to explain why this happens from a Material Science standpoint.

First Equation that you need to understand is Ohms Law.

1. Ohms Law states that: V=IR

Where V is voltage, I is amperage, and R is resistance. Higher voltage means more amperage or less resistance.

A step up from this equation is the resistiviy equation. Resistivity is a mechanical property, different than resistance. The relationship between resistivity and Resistance can be seen in equation 2. Resistivity is dependent on Temperature, resistance is not.

2. R = P L/A

In this equation P is going to be resistivity, R is resistance, L is length (such as length of a wire), and A is cross-sectional area (of a wire). We can see that as P (resistivity) increases The resistance will increase. A larger cross sectional area will also increase Resistance.

The final equation to tie this all together is the conditions effecting resistivity. There are 3 major things that will determine the resistivity of a material. They are temperature, impurities, and deformation.

3. P (total) = P (thermal vibration) + P (impurities) + P (deformation)

P(total) is the total resistivity, and the other P's are the factors of resistivity. This equation shows that the higher the temperature, the more thermal vibrations will occur, thus causing a higher resistivity. At extremely cold temperatures such as -100 C the thermal vibrations of the atoms will be much smaller then at room temp. These smaller vibrations translate into a loss of less kinetic energy. This means that effiecency is greatly improved at cold temps. You will get a higher overclock with less voltage at these extreme temps. The other two factors, impurites and deformation also play a role in resistivity. A high purity copper with a mirror finish will have low resistivity.

Well I hope this helps explain why cold temps are better for overclocking, note that some electrical components such as capacitors will fail at extreme cole temps. Also these equations only apply to electron flow in metals, seimi-conductors or ceramics may be different. Peace!
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post #2 of 4
Awesome FAQ dude, but you should put this in the FAQ section

That way it will always be easy to find
 
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post #3 of 4
Thread Starter 
Quote:
Originally Posted by Krunk_Kracker
Awesome FAQ dude, but you should put this in the FAQ section

That way it will always be easy to find
Thanks, I tried to post an FAQ on this a few days ago, but I guess the FAQ section is still being updated.

Glad you like it, this is a college level understanding of the subject, and I found it very interesting. Most people I know thought resistance decreased with lower temps, but it is actually resistivty.

I have some good information on the manufacturing of wafers for integrated circuits that I would also like to share.
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post #4 of 4
how do you post an faq?
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