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Intel Pentium M Centrino faster than Intel Pentium 4 ?
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Intel Pentium M Centrino faster than Intel Pentium 4 ? Bad Disciple 07-13-2005
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Posted by Bad Disciple on July 13, 2005, 12:05 am
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 Hi folks,

Is it true that the processor Intel Pentium M Centrino system is faster
than the normal Intel Pentium 4 ? E.g. Intel Pentium M Centrino of
1.7GHz corresponds +/- to Intel Pentium 4 of 2.4GHZ ?

Thnx to feedback,
--
Bad Disciple
"O n e t h i n g I k n o w i s t h a t I k n o w n o t h i n g"




Posted by Andrew J on July 12, 2005, 10:19 pm
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>Hi folks,
>
>Is it true that the processor Intel Pentium M Centrino system is faster
>than the normal Intel Pentium 4 ? E.g. Intel Pentium M Centrino of
>1.7GHz corresponds +/- to Intel Pentium 4 of 2.4GHZ ?
>
>Thnx to feedback,

Yes.


Posted by Andrew on July 12, 2005, 10:27 pm
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: Hi folks,

: Is it true that the processor Intel Pentium M Centrino system is faster
: than the normal Intel Pentium 4 ? E.g. Intel Pentium M Centrino of
: 1.7GHz corresponds +/- to Intel Pentium 4 of 2.4GHZ ?

Yes, in effect, (1.7GHZ P-M closer to 3GHZ P4 I think) but there are a
couple of variables. For one, there are a couple of different
versions of Pentium M. The original, Banias, had only a 1MB cache;
the newer Dothan has a 2MB cache and will be a little faster perhaps
at the same clock speed.

Pentium M also does not have hyperthreading that the Pentium 4 has, so
when parallel tasks are executed, Pentium 4 has an advantage.

Andrew
--
----> Portland, Oregon, USA <----
*******************************************************************
----> http://www.bizave.com <---- Photo Albums and Portland Info
----> To Email me remove "MYSHOES" from email address
*******************************************************************



Posted by J. Clarke on July 12, 2005, 8:52 pm
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Andrew wrote:

> : Hi folks,
>
> : Is it true that the processor Intel Pentium M Centrino system is faster
> : than the normal Intel Pentium 4 ? E.g. Intel Pentium M Centrino of
> : 1.7GHz corresponds +/- to Intel Pentium 4 of 2.4GHZ ?
>
> Yes, in effect, (1.7GHZ P-M closer to 3GHZ P4 I think) but there are a
> couple of variables. For one, there are a couple of different
> versions of Pentium M. The original, Banias, had only a 1MB cache;
> the newer Dothan has a 2MB cache and will be a little faster perhaps
> at the same clock speed.
>
> Pentium M also does not have hyperthreading that the Pentium 4 has, so
> when parallel tasks are executed, Pentium 4 has an advantage.

Not necessarily. Hypertheading is a crutch to get more performance out of
the very deep pipeline in the P4. The pipeline in the Pentium M is not as
deep, so hyperthreading would be less of an advantage.

> Andrew
> --
> ----> Portland, Oregon, USA <----
> *******************************************************************
> ----> http://www.bizave.com <---- Photo Albums and Portland Info
> ----> To Email me remove "MYSHOES" from email address
> *******************************************************************

--
--John
to email, dial "usenet" and validate
(was jclarke at eye bee em dot net)


Posted by William Korvine on July 13, 2005, 2:05 pm
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> Hi folks,
>
> Is it true that the processor Intel Pentium M Centrino system is faster
> than the normal Intel Pentium 4 ? E.g. Intel Pentium M Centrino of
> 1.7GHz corresponds +/- to Intel Pentium 4 of 2.4GHZ ?
>
> Thnx to feedback,

Surprisingly, yes. I can't find the article, but the reasons go something
like this. The Pentium M (Centrino) is based off the Pentium III core (or
one of them). This core is very successful with relatively low power
consumption, so after Intel decided to sideline the PIII, it continued to
be advanced as a low power chip and eventually evolved into Centrino. Why
did Intel sideline the PIII? Not sure, but probably because of something
to do with clock speeds. It wouldn't clock high enough at the time, or it
didn't extend to really high performance computing, or something like
that.

The Pentium IV was designed for high speed. Unfortunately, it has
problems. It is sort of like a race car that can go terribly fast on a
straight-away, but has trouble with the turns. In the PIV's case, to get
pure speed it has a very long pipeline (42 steps I think). The problem is
that if it mis-predicts a branch, the entire pipeline has to be discarded
and reloaded at a speed penalty. This apparently happens commonly enough
that, clock-for-clock, the Pentium M get's more done.

I wish I knew what stops them from pushing the PM's clock speed to those
of the PIV and have a faster processor with lower power consumption.

..wk.


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