Re: Floating point energy
- From: Ian Parker <ianparker2@xxxxxxxxx>
- Date: Tue, 29 Sep 2009 15:09:57 +0200 (CEST)
A much better way to look at this is kT. The cost of computing a bit
is nkT. Assuming 77C or about 350K this gives us
k=1.3806503 × 10^-23
n*2*10^-21 joules per bit. If we assume a 3GHz clock this gives us
6n*10^-12 watts per bit stream. A 64 bit machine will in practice have
several things going on at once. Let us give a ballpark figure of 1000
bit streams. This gives us 6n*10-9
n in practice has got to be at least 20 to eliminate the possibility
of chance errors. Finally we get a minimum energy of 10^-7 watts per
core. Figures for the best computers involve about 5w per core.
It is clear that although Moore's law may be nearing its end as far as
sizes of components is concerned, in terms of energy consumption there
is still a very long way to go.
- Ian Parker
.
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