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- Path: sparky!uunet!ogicse!psgrain!charnel!rat!polyslo.csc.calpoly.edu!rteasdal
- From: rteasdal@polyslo.csc.calpoly.edu (Rusty)
- Newsgroups: comp.sys.ibm.pc.hardware
- Subject: Re: Top speed of Intel 80387DX
- Keywords: math coprocessor intel 80387
- Message-ID: <1992Nov12.175832.1021@rat.csc.calpoly.edu>
- Date: 12 Nov 92 17:58:32 GMT
- Article-I.D.: rat.1992Nov12.175832.1021
- References: <BxKELw.Dyz@news.cso.uiuc.edu>
- Organization: Cal Poly State Univ, CSC Dept, San Luis Obispo, CA 93407
- Lines: 35
- Nntp-Posting-Host: polyslo.csc.calpoly.edu
-
- In article <BxKELw.Dyz@news.cso.uiuc.edu> berger@atropa (Mike Berger) writes:
- >I am making some changes to my 80386 CPU board, and have considered
- >upgrading to 40 MHz. I have a genuine Intel 80387 rated for 3 MHz.
- ^
- Wow! You're going to run the 80387 at more than 1300% of its
- rated speed? :-) Sorry, couldn't resist.
-
- >The Intel manual says that it "may not function at higher speeds".
- >The Intel tech support line representative told me it definitely
- >will NOT work at higher speeds.
- >
-
- Considering that the fastest '386 Intel makes is the 33 MHz,
- and that the only faster part is made by AMD, their hated competitors
- who had the temerity, the unmitigated gall, to challenge Intel's nice,
- safe, comfortable and obscenely profitable 386 monopoly, I suspect that
- this is sour grapes. However, I would not at all put it past Intel to be
- _deliberately_ producing FPUs that won't work reliably at the higher
- clock speeds of the AMD part. You could always buy a Cyrix FPU, which
- is spec'd to run at 40 without problems.
-
- >Has anybody actually run Intel's 80387 at 40 MHz? What are the
- >chances that it will work reliably?
- >
-
- Can't speak to math coprocessors, but Intel CPUs have a good
- record of being reliably overoscillated. I'm typing this on a 486SX/25
- juiced to 33 with a fast crystal and a chip fan; works just fine.
-
-
-
- --
- |||||||| Russ Teasdale -- rteasdal@polyslo.CalPoly.EDU -- (Rusty) ||||||||
- -------------------------------------------------------------------------------
- "Gentlemen, if we do not succeed, then we run the risk of failure." - D. Quayle
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