Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!samsung!zaphod.mps.ohio-state.edu!rpi!crdgw1!ge-dab!tarpit!bilver!alex
From: alex@bilver.UUCP (Alex Matulich)
Newsgroups: comp.sys.ibm.pc
Subject: Re: 20 Mhz 386 SX (?)
Keywords: Citrus and how do you do it?
Message-ID: <510@bilver.UUCP>
Date: 1 Mar 90 02:52:42 GMT
References: <1109@watserv1.waterloo.edu> <25E9799E.5768@maccs.dcss.mcmaster.ca> <29306@amdcad.AMD.COM>
Reply-To: alex@bilver.UUCP (Alex Matulich)
Distribution: comp
Organization: W. J. Vermillion, Winter Park, FL
Lines: 25

In article <29306@amdcad.AMD.COM> phil@pepsi.AMD.COM (Phil Ngai) writes:
>|   I've heard that microprocessors are actually supposed to be able to run
>|at up to 1.5x the rated clock speed.  This doesn't make much sense to me,

>Let me assure you that this is indeed nonsense. It is true that a
>reputable semiconductor manufacturer will include some margin to allow

>...etc...


Just for general information -- someone from Motorola once told me that
the margin for a 68010 is about 20%.  He said that if you plan to push it
that far, it's best to use the kind that comes in a ceramic case instead
of bakelite.  The reason is that the problems associated with pushing
the clock speed arise from overheating, and the ceramic chips dissipate
heat a little better than the bakelite ones.

I know a few Amiga owners who successfully pushed 12 MHz 68010's to 14 MHz,
so I guess it can really be done.

-- 
     ///  Alex Matulich
    ///  Unicorn Research Corp, 4621 N Landmark Dr, Orlando, FL 32817
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