Article View: comp.arch
Article #20833Re: 486 and 68040
From: Dave Haynie
Date: Tue, 18 Apr 1989 23:16
Date: Tue, 18 Apr 1989 23:16
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1237 bytes
in article <12435@reed.UUCP>, mdr@reed.UUCP (Mike Rutenberg) says:
> From my memory, the other things that stand out about the i486:
> * the on-chip fpu is much faster than the 80387. It was unclear
> if this was due simply to being on-chip or whether it involved
> architecture changes to the fpu.
If you did nothing else, moving the math chip on-board would speed things
up several times. Just the delays in crossing an external bus make a big
difference. Inside a chip, gate delays are on the order of 1ns or better,
outside on the order of 10ns.
> Mike Rutenberg Reed College, Portland Oregon (503)239-4434 (home)
--
Dave Haynie "The 32 Bit Guy" Commodore-Amiga "The Crew That Never Rests"
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arc1-ca.pugleaf.net!utzoo!dptcdc!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!cs.utexas.edu!uunet!cbmvax!davehReferences:
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Path: arc1-ca.pugleaf.net!utzoo!dptcdc!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!cs.utexas.edu!uunet!cbmvax!daveh From: daveh@cbmvax.UUCP (Dave Haynie) Newsgroups: comp.arch Subject: Re: 486 and 68040 Message-ID: <6629@cbmvax.UUCP> Date: 18 Apr 89 23:16:45 GMT References: <12435@reed.UUCP> Organization: Commodore Technology, West Chester, PA Lines: 18