Subject: Re: Incredible!
From: Sean O. Denney (sdenney@cise.ufl.edu)
Date: Wed Sep 12 2001 - 15:16:57 MDT
Yes, but Altivec's 128-bit registers and shorter pipelines make the
processor perform more operations per clock cycle than the P4's 32-bit
registers and longer pipelines. Even if the program you are using
doesn't use Altivec, the PPC G4's FPU registers are 64-bit, double
that of the P4. The integer units are still 32-bit for both
processors, but a modelling program most likely uses the FPU and not
the IntU.
Hope this explains it. If not, try www.arstechnica.com and check out
their comparison of the P4 vs. G4.
Another thing is that the MP scalability of the G4 is supposedly
better than the P4. Meaning that the G4 performs more efficiently
under MP than the P4.
--- Sean
On Wed, 12 Sep 2001, Mac Man wrote:
> I just got through running an alpha of the modelling program I am
> working on, under both RedHat and YDL, and I don't understand it. Could
> someone who is technically minded, explain to me why this G4, Dual
> Processor 800 MHz, goes about 15 times faster then the Dual Processor
> Pentium 4, 1.8 GHz. Both machines have 1.5 Gigs of Memory. I'm a
> mathematician not a computer guru. And my math skills say that 1.8
> GHz >> 0.8 GHz.
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