Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!usc!elroy.jpl.nasa.gov!mahendo!wlbr!lonex.radc.af.mil!ratazzie
From: ratazzie@lonex.radc.af.mil (E. Paul Ratazzi)
Newsgroups: comp.sys.ibm.pc
Subject: Info on Intel '387
Keywords: 80387, power dissipation, Cyrix, Intel
Message-ID: <1991Mar26.175516.20197@lonex.radc.af.mil>
Date: 26 Mar 91 17:55:16 GMT
Sender: ratazzie@lonex.radc.af.mil (Edward P. Ratazzi)
Organization: Rome Laboratory (USAF/AFSC)
Lines: 19

I have a Cyrix 83D87 Coprossesor which seems to be causing thermal problems
on my CPU/memory ("two-boards-into-one-slot-stuck-together-like-a-sandwich"
configuration) card.

Since the manufacturer of the CPU card probably tested the setup using an
Intel 80387, I am curious if the Cyrix chip's power dissipation is 
significantly different than that of an Intel 80387, thus causing thermal
problems which wouldn't occur if I used an Intel chip.

Question --->>>  Does anyone know the maximum power dissipation of an Intel
80387, running at 25MHz?  How about at 33MHz?

Thanks,

-- 
E. Paul Ratazzi                                |      ratazzie@lonex.radc.af.mil
Microelectronics Reliability Division          |            COMPMAIL:  e.ratazzi
Rome Laboratory                                |                  (315) 330-2946
"Exploring the Invisible Frontier"             |                    DSN 587-2946