memory bandwidth on Athlon systems

[Guignon Thomas]

Hello,
We have recently received an Athlon 700 system (Abit KA7 + 2 x 512M
pc100) and stream benchmark give poor results (even when using
turbo mode) compared to my old K7M with an Athlon  600. Here
are the results:

zephyr: 700 kx133 pc100 turbo (2x512) ABIT KA7
-------------------------------------------------------------
This system uses 8 bytes per DOUBLE PRECISION word.
-------------------------------------------------------------
Array size = 999936, Offset = 0
Total memory required = 24.9 MB.
Each test is run 10 times, but only
the *best* time for each is used.
-------------------------------------------------------------
Your clock granularity/precision appears to be 1 microseconds.
Function      Rate (MB/s)   RMS time     Min time     Max time
Copy:         302.8281       0.0529       0.0528       0.0530
Scale:        300.8701       0.0533       0.0532       0.0533
Add:          342.1093       0.0703       0.0701       0.0714
Triad:        338.7202       0.0709       0.0709       0.0709

copernic: 600 amd750 pc100 (1x128) ASUS K7M
-------------------------------------------------------------
This system uses 8 bytes per DOUBLE PRECISION word.
-------------------------------------------------------------
Array size = 999936, Offset = 0
Total memory required = 24.9 MB.
Each test is run 10 times, but only
the *best* time for each is used.
-------------------------------------------------------------
Your clock granularity/precision appears to be 1 microseconds.
Function      Rate (MB/s)   RMS time     Min time     Max time
Copy:         358.9613       0.0447       0.0446       0.0450
Scale:        436.5540       0.0367       0.0366       0.0368
Add:          447.4549       0.0537       0.0536       0.0537
Triad:        451.6738       0.0533       0.0531       0.0535

As you see the old system is by far superior to the new one.
I wonder if anyone has some experience with the Abit KA7 to help me
solving this problem?

A+
-- 
Thomas Guignon (guignon at asci.fr)
Laboratoire ASCI, ORSAY(France), www.asci.fr
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