Re: Looking for a list of processor instructions
From: E. Rosten (spamtrap_at_crayne.org)
Date: 08/06/04
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Date: Fri, 6 Aug 2004 17:35:41 +0000 (UTC)
Percival wrote:
> Electrons move at the speed of light for one thing, making that faster
> is... well just doesnt make sence :)
They don't move at the speed of light. Electrons in a conductor usually
move very slowly. I can't remember the figures, but the speed is
something like 1cm/s or maybe much slower.
The electric field which pushes them along, however moves at the speed
of light in the substance. So, in the case of a pair of parallel wires
in a vacuum, the speed that the signal wil lpropagate will be c (speed
of light), since the substance the field is propagating through is a
vacuum. In co-ax cable, where the stuff between the two conductors is
not a vacuum, the speed of propagation of a signal is about .9 c. The
propagation speed depends on the relative permiability of the material.
> Electrical components are slow because they have to "fill up" with
> electrons before taking effect.
Well, there's capactive and inductive effects. As well as propagation
speeds.
> So if it allows more amps to get through
> then all they did was just make a bigger wire, and now computers suck up
> more electrisity.
>
> So this really just puts them at a situation where chips are now able to
> fill up faster, which is why high power chips are faster. Either way,
> it just means now we have a chip that sucks up more power to get faster.
Kind of. Also, with very small (and therefore faster) devices, there is
more leakage. This has now started to become significant in CPU design,
where as previously, only watch-makers worried about it. Also, when a
COMS pair make a transition, they pass through a point where they both
conduct. The more times a second this happend, the more power they
dissipate as heat.
-Ed
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