Re: AMD vs Intel - Ghz & performance question

David Kanter wrote: 
As for why the AMD's do so much better at a given Mhz? It's mostly
because the AMD's do more work per clock cycle than the P4's. That's why
Intel is phasing its P4's out, and eventually replacing them with
derivations of its Pentium-M mobile processor.



No it's not.  Intel is phasing out the Pentium 4 because increasing the
clock rates increased the thermal and power requirements too much.  The
fact that their replacement has more emphasis on IPC is a result of
that, not the cause.


You may quibble if you wish.

The P-M's are closer in
philosophy to the AMD processors, i.e. do more work per clock cycle.



It's funny how you try and make this situation sound like Intel is
following in AMD's footsteps.  When, ironically, Intel is simply
returning to prior successes (the P6 and derivatives.  Moreover, the
philosophy behind AMD's processors is 'balanced design', not braniac
(although it is all relative).

It was a philosophy that Intel *used* to follow, and then it abandonned in favour of the Pentium 4. It was forced to readopt the philosophy due to its competition.

The only CPUs that really focus on doing the most work per cycle are
Itaniums.  One might also consider the POWER5 in that category, but it
does have a rather long pipeline.

Wonderful. Anyways, "brainiac" was your interpretation. All I ever said was "higher IPC".


Hypertransport really is only worth 10% performance gains for single
socket systems...nobody has really offered proof otherwise.  Especially
since for single socket systems the FSB is only used for memory and
I/O...just like HT.

Hypertransport is not used for memory, just i/o; the integrated memory controller is not part of the HT system. Well, in multi-socket systems, the HT is kind of used for memory when two processors share cache contents with each other, but that's really just part of interprocessor communications, not memory per se.

However, there are some well-known areas where HT has helped even in single processor systems. That would be the situation when you're using Nvidia's SLI dual-graphics. It's been shown that you gain more performance when going to SLI with AMD systems. I believe the percentage increases are between 20-40% in Intel systems, whereas it's between 60-70% in AMD systems, comparing Nvidia's own Nforce chipsets against each other.

	Yousuf Khan


--
Everybody was flying across the sky, Superman was out of town
.

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