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Article View: comp.sys.ibm.pc.hardware.misc
Article #651

Speed problems

#651
From: Dave Rolo
Date: Sat, 27 Jul 1996 00:00
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Hi there!  Here's a good little problem for you guys.  I had a 386dx40 
motherboard and cpu in a system and got a hold of a 408dx33 motherboard 
and cpu.  I installed the new motherboard (and I've done this a million 
times) and the system ran slower than the 386dx40 motehrboard.  All the 
jumpers are correct, I tried different CPU's and still had the same 
result.  Norton sysinfo rated the CPU performance at about 23, about 15 
points below a 386dx33!  I got ahold of another motherboard, different 
brand (one that I have worked with many times before with great results) 
and in one case, used a 486dx33, and in another case used an AMDdx2/80. 
With the dx2/80 cpu, sysinfo rates the CPU performance at about 38, just 
over a 386dx/33.  I remind you, this is with a completely different 
motherboard and cpu that I KNOW work!  Fine...maybe there is a bottleneck 
somewhere so I completely remove the network card and cd-rom controller 
and put a new Trident video card and a high speed LAVA controller card.  
Still...the same result.  The CMOS is set at the best possible ratings 
(I've tried multiple configurations with the cache, DMA, shadow RAM, 
etc.) and the jumpers are correct according to Seanix tech support (the 
manufacturer of the board).  The only thing I haven't changed is the 
power supply and the drives (but I can't justify doing all that work just 
as a shot in the dark).  Any input would be greatly appreciated...please 
e-mail the reply to dave@mmbc.kosone.com.

Thanks...Dave Rolo 
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From: dave@mmbc.kosone.com (Dave Rolo)
Subject: Speed problems
Date: 1996/07/27
Message-ID: <4tdcv0$o6r@apollo.kosone.com>
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newsgroups: comp.sys.ibm.pc.hardware.misc,comp.sys.ibm.pc.misc,demon.tech.pc