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Article #675

Re: RAM speed, External Cache & i486-DX266 CPU

#675
From: Doug Flere
Date: Thu, 21 Mar 1996 00:00
46 lines
2653 bytes
In article <314F6D16.385C@psu.edu>, wjg109@psu.edu says...
>
>futility wrote:
>> 
>> David Longley <David@longley.demon.co.uk> wrote:
>> 
>> >I have a curious problem which I need a definitive technical solution to.
>> >
>> >Motherboard:  VL (one slot, est ISA)
>> >CPU        :  i486-66DX2
>> >Cache      :  256K
>> >RAM        :  4 x 80ns + 4 x 100ns parity
>> >BIOS       :  AMIBIOS 1991
>> >
>> >Problem..
>> >
>
>I had a similar problem when I upgraded from an Intel 486dx33 
>chip to an Intel 486dx4/100.  I had flaky problem when I would 
>do certain things, random system lockups, weird display 
>problems etc.  It would work fine when I disabled my L2 cache.  
>But when my cache was enabled, my computer was much slower (as 
>measured by Norton System Information).  With the cache enabled 
>I was just a little above a 486dx33, with it disabled I was 
>almost 3x faster than a 486dx33.  
>     I called Intel and they told me to disable my L2 cache....  
>Everything seems to work ok now, but it bothers me that I have 
>this cache sitting on my MB not being used.  Anybody have any 
>suggestions?
>
>        486dx33 -> 486dx4/100
>        256K - 20ns cache (currently disabled)
>        AMI Bios 1992
>
>Maybe I need faster cache or something.  Please let me know if 
>you get your problem fixed.

I had the same problem when I went from a DX33 to a DX2/80. I have similar
system, AMI Bios 11/11/92.  What I had to do was to change the cache *READ*
wait state to 1WS from 0WS. Note that this is different from the cache
*WRITE* wait state setting commonly found in the Bios setup program and 
called "cache wait state". If your bios doesn't allow you to change these
settings directly, let me know. There is another way to do it.

DJF
k_foste@alcor.concordia.ca
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From: k_foste@alcor.concordia.ca (Doug Flere)
Subject: Re: RAM speed, External Cache & i486-DX266 CPU
Date: 1996/03/21
Message-ID: <4is905$6tv@newsflash.concordia.ca>
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references: <826745441snz@longley.demon.co.uk> <31489ac7.94776@news.demon.co.uk> <314F6D16.385C@psu.edu>
organization: Concordia University, Montreal, Canada
newsgroups: comp.sys.ibm.pc.hardware.chips,comp.periphs,comp.sys.intel,demon.tech.pc
nntp-posting-user: k_foste