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- Newsgroups: comp.sys.sgi
- Path: sparky!uunet!elroy.jpl.nasa.gov!ames!sgi!twilight!zola!ipecac!steev
- From: steev@ipecac.esd.sgi.com (Motorin' Flarey Henderson)
- Subject: Re: Multiprocessor Crimson?
- Message-ID: <v5nb06c@zola.esd.sgi.com>
- Sender: news@zola.esd.sgi.com (Net News)
- Organization: Silicon Graphics, Inc. Mountain View, CA
- References: <3304@contex.contex.com> <v4fbv18@zola.esd.sgi.com> <1jkgn3INNsmh@spim.mti.sgi.com> <1993Jan21.044828.17595@ringer.cs.utsa.edu> <1993Jan21.104509.11830@cc.ic.ac.uk>
- Date: Thu, 21 Jan 93 19:06:40 GMT
- Lines: 40
-
- In <1993Jan21.104509.11830@cc.ic.ac.uk> vulture@imperial.ac.uk (Thomas Sippel - Dau) writes:
-
- >In article <1993Jan21.044828.17595@ringer.cs.utsa.edu>, senseman@lucy.brainlab.utsa.edu (David M. Senseman) writes:
- >[qouting R4400 announcement]
- >.....
- >- >The R4400 microprocessor is a pin-compatible upgrade to the MIPS R4000* and is
- >- ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
- >- Hmmm...I wonder what would happen if I swapped my Indigo's R4000 with a R4400
- >- (besides void my warranty :) Wonder how soon Radio Shack will start stocking
- >- R4400's in those cute little containers with a cardboard back and a clear
- >- plastic front?
-
- >Unless you damaged the motherboard in the process of hedgehog extraction,
- >it should work very well, chugging along at 50 MHz with beautifully clean
- >signal waveforms. Connect an oscilloscope and enjoy while you compute.
-
- Make sure the part is a 5V part! Plugging in a 3.3V part is a good way
- to blow ~$1000. I've been out of touch with the R4400 lately, so I'm not
- sure which voltage and frequency will be available in what time frame.
-
- The CPU comes out very easily, if you have the special tool available from
- the socket vendor.
-
- >If you however change the timing crystals as well, you will probably see the
- >odd bit of blue smoke from some parts of the random logic on the motherboard.
- >I would be very surprised if you could actually get that to work for more than
- >a few hours - if at all.
-
- It is possible to increase the frequency beyond 50MHZ (with the appropriate
- speed 5V CPU, of course) as long as you keep the external interface running
- at 50MHZ or less. I'll leave this as an exercise for the reader who doesn't
- care about voiding their warranty %^>
-
- Steve "Anarchist Hardware Hacker at Heart" Valin
-
-
-
- --
- steve valin steev@sgi.com
- It's like deja vu all over again...
-