[RC5] P4 Speed Question

Ray Booysen rjb-dis at iafrica.com
Thu Jun 14 08:31:30 EDT 2001


I thought dual Athlons weren't available to the general public.

Ray Booysen
----- Original Message -----
From: "Andrzej Hamka³o" <niktu at dcc.pl>
To: <rc5 at lists.distributed.net>
Sent: Wednesday, June 13, 2001 6:59 PM
Subject: RE: [RC5] P4 Speed Question


> > It is, the nForce chipset from nvidia introduces dual DDR sdram banks
with
> > a combined bandwidth of more then the dual channel rdram that intel is
> > pushing for the p4 and with much lower latency.
> >
> > On Wed, 13 Jun 2001, dan the person wrote:
> >
> > > Peter Cordes wrote:
> > >
> > > > On Tue, Jun 12, 2001 at 12:31:49AM +1200, dan the person wrote:
> > > > > Only thing super about a p4 is it's super high price.
> > > >
> > > >  In their defence, they do have more memory bandwidth than
> > > > any other PC
> > > > hardware, with dual rambus channels feeding a 400MHz bus.
> > > >
> > >
> > > Is this not more a feature of the motherboard chipset than the
> > CPU design?
>
> Well, time to spam out of list subject a bit ....
>
> Processor-memory bandwith depends on motherboard (chipset, type of ram)
> or processor (type of processor bus)
> - every time you get LOWER value of both, slower componnent chokes other
...
> (extra ram bandwith could be used ie. by graphic pocessor, or in propely
> designed
> dual system - Intel designs do not apply, there all procs share same bus
> ...)
>
> Latencies (of memory, chipset and proccesor bus are additive - and
> bigger latency is bad, FYI ;)
>
>
> and now short look back:
> <SLB>
> RDRAM (big latency, big bandwith) +
> first incarnation Pentium III (100Mhz single pumed bus - rather slooow,
> even newer 133 version don't catch up even close with RDRAM)
> =
> what you get?
> you right!, weak points of both (big latency, low bandwith system)
> - but you are proud owner of most expensive system in shop :))))))
> - congrats to INTEL for that ingenious idea
> </SLB>
>
> and now present:
> best of best list:
> DDR RAM - highest badwith, lowest latency, sane price
> nForce chipset - make that bandwith twice :), one but:
> you can use it up for bulitin geforce MX ...
>
> P4 100*4 bus - nice thingie, but besides bus there are other thingie
> in processor to watch not to screw up ...
>
> AMD's fastest Proc bus is 133*2
> (if only AMD would launch 266*2 procs :)
>
> For accuracy: I know, width of bus are important too (took that under
> consideration, thats why i won't say that RDRAM's  are fastest :)
>
>
> <rant>
>
> But Mhz are THE MOST IMPORTANT, right?
> Then people buy 1,7GHz P4 system and are suprised ...
>
> I bet, the same money could buy you dual Athlon DDR system ...
> (if not 1,4Ghz kind, certainly 1,33, but considering prices of RDRAM,
> and i850 motherboard i think you could even save on dual 1,4Ghz  :)
> you would be suprised, this time rather positively ...
>
> Most people don't get it that even single 1,4Ghz Athlon performs better
than
> 1,7GHz P4 ...
> especially on code unoptimized for P4 (currently? - about 98%)
>
> Then, most programs that ARE optimized for P4, (or for some strange
reason,
> run better :) can take advantage of second processor (2 in price of 1,
> remember?)
>
> I will not compare cow speed on these systems ... (quick guess: 4:1 in
favor
> AMD,
> somebodybdy check that and precise it out), because rarely somebody buys
> system only to run dnetc.
>
> I can't think of application that would justify P4 existance in current
form
> ...
>       ... then again you could run Quake III under win ME  :)))  (scratch
> one Athlon :))))
>
> Now you know why Intel launched 1,3GHz cheepo P4. If somebody wants
> develop and optimize his apps for P4, you can't force poor guy to waste
too
> much
> money :)
>
>
> </rant>
>
> Always wanted to write that:
> Dear Intel, please make good motherboard chipset at last (DDR?, hoping),
if
> Via won't have good
> concurency, they won't improve their chipsets as much... (that nasty
latency
> thing ...)
> BX owner
>
>
>
> PS. I didn't bored you to death?, did you really read all of this?, wow :)
>
> PPS. excuse my keyboard, it sometimes can't spell propely ;) and
> excuse me for being blunt, just got fed up with today exam, and had to let
> off steam ...
>
> PPPS. Weird, all my essays always came out shorther than this ...
>
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