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P4 vs Centrino? Which of these laptops?



 
 
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  #11  
Old June 26th 03, 11:21 PM
Robert Myers
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On 26 Jun 2003 09:50:48 -0700, (LRW) wrote:

Robert Myers wrote in message . ..
On 26 Jun 2003 06:56:25 -0700,
(LRW) wrote:

Common wisdom: 1.6GHz centrino=2.4GHz P4, so 1.3GHz=2GHz P4.

Centrino executes (on the average) more instructions per clock than
the P4.


Thanks for the feedback! But, "common wisdom"?


You can look up the benchmarks if you like. The actual comparision
will vary from one task to another, but the rule of thumb I gave is
accurate enough for making a purchasing decision.

I didn't know that.
(One of the reasons I'm asking about the differences.) Why is it that
the Centrino executes more instructions? Does it have to do with the
double sized L2 cache?

I haven't seen a benchmark that would give insight into the role of
the larger cache. Banias (Centrino) is closer in design to the P3
than to the P4. Of the AMD and Intel microprocessors currently in
use, the P4 has the highest clock, the longest stack, and the lowest
instructions per clock. These three items are not independent. The
longer stack allows Intel to clock the P4 faster but means that
pipeline stalls are more expensive (the number of clocks lost due to a
stall is equal to the length of the stack).

Banias is faster than the P3 at the same clock rate because Intel did
some clever things, like micro-op fusion, to reduce power consumption
and get more effective work at the same clock rate.

I have heard that AMD does the same thing which is why they can
outperform Pentiums of the same speed even with their lower FSB. (Do I
have that right?)

Intel has dug its own grave on this one, and I don't particularly want
to pull them out of it. For the reasons given above about the length
of the P4 stack, the P4 performs noticeably fewer instructions per
clock than the P3, Centrino, or any of the Athlon chips. In general,
P4 shines on tasks, like multi-media, that involve high-speed
processing of lots of data in a predictable way, and looks more like a
dog on legacy office applications and branchy code like a compiler or
pointer-chasing code like lisp.

I'll leave the AMD cheerleaders of csiphc to argue that the AMD chips
are the best of all. They may well be, but for reasons that I have
discussed here more than once, I don't use them.

Well, this is probably 75/25 desktop replacement. Which is one reason
that ATI Moility 9000 video card is very appealing.


I can't give any advice at all about video performance. It isn't
something I pay attention to. It does sound like you should pick the
card based on price and desktop performance.

Even with the longer battery life of my centrino portable, it isn't
enough to get through the entire day of a conference if you aren't
lucky enough to get a seat near a receptacle, so I'll probably wind up
with something like
http://www.valence.com/valence_frame.asp?vti
before I go to my next conference.

RM
  #12  
Old June 27th 03, 02:03 AM
Jake
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I can't give any advice at all about video performance. It isn't
something I pay attention to. It does sound like you should pick the
card based on price and desktop performance.

Even with the longer battery life of my centrino portable, it isn't
enough to get through the entire day of a conference if you aren't
lucky enough to get a seat near a receptacle, so I'll probably wind up
with something like http://www.valence.com/valence_frame.asp?vti
before I go to my next conference.

RM


One magazine review showed I think a Toshiba Centrino run for
for 6+ hours, most other P4/Celerons laptops were ~ 2-3 hours


 




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