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From: Christoph Kukulies <kuku@gilberto.physik.rwth-aachen.de>
Message-Id: <199612090720.IAA06380@gilberto.physik.rwth-aachen.de>
Subject: Re: Amd (K5) 586 /133
In-Reply-To: <Pine.BSF.3.95.961208222826.29921B-100000@harlie> from "Eric J. Schwertfeger" at "Dec 8, 96 10:30:08 pm"
To: ejs@bfd.com (Eric J. Schwertfeger)
Date: Mon, 9 Dec 1996 08:20:27 +0100 (MET)
Cc: msmith@atrad.adelaide.edu.au, cau@cc.gatech.edu,
        kuku@gilberto.physik.rwth-aachen.de,
        freebsd-hackers@freefall.freebsd.org
Reply-To: Christoph Kukulies <kuku@gilberto.physik.rwth-aachen.de>
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> 
> 
> On Mon, 9 Dec 1996, Michael Smith wrote:
> 
> > Carlos Ugarte stands accused of saying:
> > > 
> > > > I bought an A-Star (i430VX) mainboard and put in an Amd (K5) 133 MHz CPU.
> > > > dmesg tells me 100.23 MHz. Who's cheating?
> > 
> > > No one, really.  I'm pretty sure AMD uses a similar "rating"
> > > scale to Cyrix - the particular chip you have is called something
> > > like a K5-PR133, where PR stands for Pentium Rating (or something
> > > similar).  It actually runs at 100 MHz, but its performance was
> > > found to be "equivalent" to a Pentium 133 MHz.
> > 
> > I don't think so.  This is a 2.2 system with an AMD K5-PR100 :
> > 
> > Calibrating clock(s) relative to mc146818A clock ... i586 clock: 100252689 Hz, i8254 clock: 1193485 Hz
> > CPU: AMD Unknown (100.23-MHz 586-class CPU)
> 
> The K5-PR100 and K5-PR133 are both 100Mhz CPU's, the PR133 just has a more
> efficient pipelining/microcoding/etc.

Aha, PR=Pentium Rating

> 
> 

--Chris Christoph P. U. Kukulies kuku@gil.physik.rwth-aachen.de