EnigmA Amiga Run 1995 November/EnigmA AMIGA RUN 02 (1995)(G.R. Edizioni)(IT)[!][issue 1995-11][Skylink CD].iso/earcd/docs/lwml9505.lha/LWML9505.TXT/[e-mail]_Sun May 14 15:26:20 1995.msg

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Date: Sun, 14 May 95 21:51:00 UTC
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Subject: PC: Dual P5/100 info
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Someone recently asked me how I had two pentiums on my motherboard as
the "second chip" wasn't in production yet.  Well, I did some asking
around and got the following information.  I was asked not to provide
source information for job security reasons, so don't ask.


Intel different revision of their chip into stepping.  For Pentium
75/90/100 MHz, there have been stepping B1, B3 and B5 so far.  B1 is the
stepping with the now famous floating point error.  B1 and B3 require a
specific CPU in the second CPU slot, i.e. to make a DP motherboard to work
you need a P54C in the primary socket and a P54CM in the secondary socket.
Stepping B5 and subsequent stepping (C1 and C2) have solve this problem,
i.e. you can plug any two B5, C1 or C2 P54C into the MB and it will work.
Since B5 was introduce at beginning of 1Q of this year, you can expect
most of the CPU out there works with DP motherboard.
   There is one exception to this rule, and it is the 120MHz Pentium.  As
I have posted in the BBS, making 90/100 MHz motherboard to work at 120 MHz
is a very minor modification, since it 120 MHz is the next multiple from
90 MHz.  Unfortunately, Intel...uh...."screw up" on the 120MHz's
multiprocessor support.  If you plugg two 120 MHz onto Dual MB, it will
probably work, but it definitely not guarantee by Intel.   You might be
seeing advertisement selling 120 MHz Dual MB....they're taking a gamble with
your system.  The correction chip will not be available until end of June;
therefore, you will not see them on the market until mid or late 3Q 95.


And there you go... that's the scoop.

Tank Taylor


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