Re: AMD vs Intel - Ghz & performance question


Yousuf Khan wrote:
> 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.

Why thank you for that privilege.

> >>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.

Part of it was competition, but another part was simply pragmatism.
Nobody doubts that 65W CPUs are easier and cheaper to deal with than
130W ones...

> > 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.

Sorry I meant the memory controller...brain malfunction there.

> 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.

That's not due to HT. That performance gap is largely due to the fact
that NVIDIA only recently started making Intel chipsets, while they've
been doing AMD chipsets for around 5 years. You'll never be able to
figure out how much of a benefit you get from HT on it's own. At least
with a memory controller, you have a chance, since you can guess the
latency without the controller.

DK

.

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