Originally Posted by
Kean
Johnny has right.
Some more:
The main guiltys are noises. When bus or transistor is working faster then normal operation speeds, there is much more noises.
There is something like heat noise. It happens when temp. are high, and it is lower when we lower temps.
Eg. when we adjust some voltage we are trying to avoid this noises, because there is higher potential, and heat noises causes by heat (because of current and resistance which generate heat) are relatively lower, and then devices can understand where is logical 1 and 0 (when noises are present, its difficult to recognise where is 1 and 0.