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- From: ercolessi@uimrl3.mrl.uiuc.edu (furio ercolessi)
- Subject: R4400 (was: Re: Multiprocessor Crimson?)
- 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> <1jmokqINNh82@spim.mti.sgi.com>
- Message-ID: <C180v5.L6q@news.cso.uiuc.edu>
- Sender: usenet@news.cso.uiuc.edu (Net Noise owner)
- Reply-To: ercolessi@uimrl3.mrl.uiuc.edu (furio ercolessi)
- Organization: MRL - UIUC
- Date: Thu, 21 Jan 1993 20:28:16 GMT
- Lines: 33
-
- In article <1jmokqINNh82@spim.mti.sgi.com>, woodacre@mips.com (Michael Woodacre) writes:
- |>In article <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
- |>
- |>Great care was taken in the design of the r4000/r4400 to allow for simple
- |>system upgrades. The speed of the external memory interface is programmable
- |>to allow it to run slower than the internals of the chip - this means it is
- |>possible to use a 75MHz R4400 in a system designed for a 50MHz R4000 simply
- |>by changing the serial boot rom that sets up the external interface speed and
- |>by changing the crystal to 75MHz. This gets you performance improvement from
- |>the chip running at a higher speed, from the larger caches and the uncached
- |>write buffer on the R4400.
-
- i know this is one of the questions which have no answer, or any answer,
- because it's application-dependent, but *roughly*, what kind of improvement in
- 64-bit floating point speed is expected from the R4400, with respect to the
- R4000? +10%? +50%? +300%?
-
- --
- furio ercolessi <furio@uiuc.edu>* <furio@sissa.it>+
- * materials research lab, uni illinois at urbana-champaign
- + intl school for advanced studies, trieste, italy
-
- "Change nothing and continue with immaculate consistency"
- [ Brian Eno, "Oblique Strategies" ]
-