Subject: CCL:Summary: AMD-K6/linux for G98

From: [email-masked] (Bernd Melchers)
Date: Fri, 5 Mar 1999 17:03:08 +0100 (MET)

'Jerry C.C. Chan wrote:'
> 
> 
> K6 is slower than PentiumII (with the same clock). Especially on floating
> point operations. This is not OS dependent, so I wouldn't expect better

some words again to this theme:
there are benchmarks comparing the brand new AMD-K6-III (*not* the AMD-K6-2-3D!)
against the Pentium III which show that even the AMD-K6-III@400MHz outperforms the
Pentium-III@500MHz (for a special application benchmark!):
http://www.ga-source.com/cgi-bin/gaimage.cgi?images/amd/Slide6.JPG

it is not only the floating point unit, which makes the Pentium-II and the Celeron
fast, it is also the builtin second level cache. The AMD-K6-III now has also
an on dye second level cache. The floating point unit itself is not faster
than the one of the AMD-K6-II.

Some additional points:
Celeron CPUs are using 66 MHz Busspeed, compared to 100 MHz for Pentium II and K6.
Celeron and K6 CPUs are not able to do multiprocessing.

Compilers usually optimize the code for Pentium or Pentium-II CPUs, but there is
a compiler which optimize also for the K6: pgcc, have a look at
ftp://ftp.goof.com/pub/pcg/source/

But Gaussian98 and CHARMM is not able to be compiled by the g77 part of
pgcc or egcs .

Ciao
Bernd Melchers

-- 
Bernd Melchers             | [email-masked]
Freie Universitaet Berlin  | "We don't write software, we compose it."
AG Macromolecular Modelling - Prof. Dr. E.W. Knapp
for more information see http://userpage.chemie.fu-berlin.de/~melchers/