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Article View: comp.sys.ibm.pc.misc
Article #678

486's with 0 wait states?

#678
From: Joseph Landman
Date: Tue, 11 Aug 1992 12:48
29 lines
2056 bytes
Fellow Nettoids:

  I had recently upgraded my home machine from an old 10Mhz 8088 to a 25Mhz 
80386sx.  While I enjoyed the increase in speed, I noted that the 386sx has 
6 wait states between memory reads/writes in 8 bit mode (and 11.5 in 32 bit 
mode).  This really annoys me.  I am aware that I could drop in a cache (
there is a slot for the optional card), but 32k is not nearly enough, and my 
code uses larger arrays in extended memory (therefore many cache misses).

So, on to the point.  I would like to know if there are any motherboards 
that are not as badly memory bandwidth limited, that have at most 1 wait 
state between main memory, and the processor, without a cache.  I am 
thinking 386 or 486 motherboards  (I am not even remotely interested in 
486sx).  I have heard that a board called the "cheetah" or similar has this 
property.  Or, if possible, is there mother board with a 1MB cache on it?  (
my arrays tend to be >3MB each).  I would like to hear about peoples 
experiences with such beasts.

Thanks for the info, I will post a summary if there is enough interest.

Joe Landman
landman@hal.physics.wayne.edu
#,:::::::;,   ::            Joe Landman  Graduate Student (PhD),
#    ::       ::            Computational Solid State Physics.
#;:  ::       ::            Physics Dept., Wayne State Univ.   
#`::::; oe    ;:::; andman  666 Hancock Avenue, Detroit MI 48202 
#Internet: landman@hal.physics.wayne.edu landman@rhic2.physics.wayne.edu
#          kil@pandora.cs.wayne.edu  jland@ss0.eng.wayne.edu
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From: landman@hal.physics.wayne.edu (Joseph Landman)
Subject: 486's with 0 wait states?
Message-ID: <landman.69.713537313@hal.physics.wayne.edu>
Summary: expensive if they exist.
Sender: usenet@cs.wayne.edu (Usenet News)
Organization: Department of Physics and Astronomy
Date: Tue, 11 Aug 1992 12:48:33 GMT
Lines: 29