*BSD News Article 82446


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From: Paul Richards <dpr@elsevier.co.uk>
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: freeBSD and P6/180
Date: 07 Nov 1996 10:30:58 +0000
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Ken Bigelow <kbigelow@www.play-hookey.com> writes:

> > You don't want a cpu at that speed either, make sure it's a multiple
> > of 33 1/3 (roughly).
> 
> Now you've got me puzzled. What's wrong with a multiple of 40 or 50 MHz
> (always assuming the motherboard can run at one or the other of thoses
> speeds)? I would expect that a higher motherboard speed would be
> desirable, too.
> 
> Could it be that the motherboard is expected to clock at 60 MHz for the
> PP180? That would make more sense to me than running a 30 MHz clock and
> a 6X multiplier.

Yes. But it sounds like you've got an out of date notion of bus
speeds. 40 and 50 Mhz is *slow*, you want to run the bus at
66Mhz. Running the bus at 60Mhz is a 6Mhz drop which people don't
think is significant until you point out it's 10%

-- 
  Paul Richards. Originative Solutions Ltd.  (Netcraft Ltd. contractor)
  Elsevier Science TIS online journal project.
  Email: p.richards@elsevier.co.uk
  Phone: 0370 462071 (Mobile), +44 (0)1865 843155