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Re: AMD vs. Intel Floating Point

  • To: mathgroup at
  • Subject: [mg29486] Re: AMD vs. Intel Floating Point
  • From: Jens-Peer Kuska <kuska at>
  • Date: Fri, 22 Jun 2001 02:20:14 -0400 (EDT)
  • Organization: Universitaet Leipzig
  • References: <9gs2vm$k4f$>
  • Sender: owner-wri-mathgroup at


a) the Mathematica speed comparsion  from
   is posted regular in this news group
b) on the www-site of *this* news group

   the second head line is a link to various speed
   comparsions found at

and it is quite natural to assume, that a poster to a 
news-group has visited the newsgroup hompage and 
is able to read and understand the headings on a page
that begins with:

>Designed by S. Christensen.
>The Email Group for Mathematica Users
>Comparison of Mathematica on Various Computers 
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>MathGroup is now linked to the moderated newsgroup 
> on the Internet. Contact your local system administrator 
> to find out how to read this new group. 

*and* it is quite natural to assume that a poster to the news group 
has read the group rules (on the same page) one of it say:

>See the links above for this. 

It must be also sayed, that the Mathematica speed depends in the
most (symbolic) applications not on the floating point power
of the CPU. The most actions performed by Mathematica are pointer
operations with it's internal data structures. I would assume that
80-90 % of Mathematica's CPU load are pure interger operations.
High precision calculations, symbolic operations, operations with
integers, rationals ... all that don't use the floating point hardware.

It depends shaply on the application how much floating point operations
are used. But when a Mathematica function has such a  huge floating
load it is always better to write a MathLink program.


Morfeas79a wrote:
> Kofi
> as it is well known the AMD processors up untill the model of K6-3D
> have serious problems in their floating point operations - this can be
> observed by running programs with great CPU load like SETI@home, the
> time for a AMD computer to finish one work unit is about twice as big
> as this in an Intel computer running on the same MHz. The problem has
> been solved in later models.  Of course all this is not known to
> Mr.Kuska who thinks that 90% of the questions sent in this newsgroup
> are of trivial nature or in anycase foolish.
> Regards
> Jim

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