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Why do artifacts happen?

S

skatiN64

n00b
Joined
Feb 1, 2008
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22
temperature is well within reasonable limit, at least at the location of the sensor.
probably gets hotter deeper within the core.
either way I guess the processor just isn't meant to run at speeds that high, but I'm somewhat curious where and how the process breaks down.
any incite would be awesome
 
increased speed = faster electron movement. faster movement = more heat. sometimes the electrons are moving so fast and generating so much heat that they "mix" up with other electrons and cause artifacts. but there are other reasons why artifacts can occur as well.
 
I think is has to do with the fact that most materials can carry less current when heated. The increased heat would reduce the amount of current it could carry without errors, so the higher the clock speed, the more likely those errors are to occur.

Theoretically, if you built a chip out of super conductors and immersed it in liquid nitrogen, the only bottleneck would be the amount of electricity you could provide.

I'm not an expert, this could be wrong.
 
there would be a limit on how fast electricity can move on said super conductor.
 
Resistance increases with temperature. In a synchronized device like a processor, certain tasks need to be completed within a given clock cycle. However, as a signal travels through the circuit, there are certain delay parameters that can affect how long it takes to complete those tasks (i.e. wire delay, bus delay, setup/hold time etc). Thus, you can only run your circuit as fast as the total delay time allows:

Fmax = 1 / Dtotal

That is, max frequency is the inverse of the total delay time. By keeping the circuit cool allows you to reduce the total delay time, which raises the max frequency. Thus, it's easy to see how lower temperature helps you run your circuit at a higher frequency. When you set the clock frequency higher than the total delay allows, you end up with unpredictable results.

Yet another tool of the OC world is higher voltage. I've discussed why higher voltage helps OC in a previous post:

http://www.hardforum.com/showpost.php?p=1031643445&postcount=37

Help that helps :)
 
risqu3 said:
there would be a limit on how fast electricity can move on said super conductor.
Click to expand...

No. The nature of superconductors is that they have no resistance, and therefore they don't limit the speed of the electrons moving through them. The only limitations would be the speed of light, the amount of energy provided, and the efficiency and power of the processor itself.
 
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