>Brian McLeod <[EMAIL PROTECTED]>
> Subject: Re: [SM] what is the bus speed of a s900?
> Date: Fri, 13 Jul 2001 10:28:37 -0400
> To: "(SuperMacs List)" <[EMAIL PROTECTED]>
>
>
>
> on 7/13/01 10:10 AM, Tom & Lisa P at [EMAIL PROTECTED]
> wrote:
>
> > Depends on the CPU. The CPU card controls the bus speed.
> Normally,
> > the highest bus speed you are supposed to go to is 50 MHz.
> However,
> > if you manually disable the L2 cache via a jumper on the
> mobo, I have
> > heard reports of ppl going as high as 66 Mhz (although that
> has to be
> > rare).
> >
> > Mad Dog
>
> How do you do that?
>
> I haven't putzed around much with the buss settings in the
> MetaJoe G3/400
> that's in my S900 but I've never gotten it to go over 50 Mhz.
> I see people
> here routinely reporting closer to or slightly over 60...
>
> I also have a hodgepodge of cheap ram in this particular
> machine that is
> only partially interleaved and I only see 33MB/sec throughput
> on Guage Pro
> which I attributed to the slow bus and cheap ram.
>
> I can't make the ram faster but I'd love to speed up the buss
> a little. Even
> if I only get 40mb/sec memory read/write that's enough for
> this machine's
> purpose (stereo editing/mastering/cd-burning)
> --
>
> A closed mouth gathers no feet...
>
Based on my experience your hodgepodge of ram is likely the limiting
factor. My ram was showing moving speed of 52-59 mb/sec when using my
older 8mb chips and 1 set of 16 mb chips all interleaved. I bought 1
128mb chip from OWC and while the other chips are interleaved the
single chip is not of course.It now runs at 37- 43 mb/ sec. i don't
know what the odds are that another chip bought later will
interleave...with the one I have. You may be able to get a bit more
ram speed by changing slots around. Most people belive your largest
pair of matched ram should start in slots A4 & B4 putting the
unmatched pairs after the pairs.
Mad Dog is a master of soldering and other tricks that many
of us can't and perhaps shouldn't try ;-)... I see no reason to risk
frying your motherboard as with the proper software and G3/4 upgrade
your machine can run at a very nice speed. My machine using XLR8's
software which lets you turn off the motherboard cache will run as
fast as 61 mhz no problems! I'm after much testing am running my XLR8
Carrier Zif w/ Apple/OWC IBM copper 500mhz cpu @ 550mhz with a bus of
55mhz. There is a point where max bus speed doesn't increase speed
that much and can lead to disk errors and overheating. So I backed
off a bit to be on the safe side.
By the way if you feel the software you are using is limiting
you with the joe card XLR8's will work fine with that card. As a
matter of fact the Joe card software is based on stolen XLR8 older
version software and is one of the main reasons they are out of
business. (They got caught and shut down to avoid the law suits)
later Will S
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