riscy
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Re: Memory bandwidth/board

To: riscy@sunsite.unc.edu
Subject: Re: Memory bandwidth/board
From: Andreas Busse <andy@waldorf-gmbh.de>
Date: Mon, 6 Dec 93 16:14:31 +0100
> The motherboard post mentions 84MB/sec read, 104 MB/sec write bandwidth I 
> assume this is for the 50 Mhz motherboard?

Right.

> So if we go with the 4200 we would be at 40 Mhz or 67.2/83.2 Mb/sec??
> Or would the bandwidth stay the same?

Don't know.

> SGI claimes 267 Mb/sec but a similiar memory interface may not be cost 
> effective (let alone designing it.)

Very impressive...

> I wrote a memory benchmark program (membench at neurocog.lrdc.pitt.edu 
> ~ftp/pub) and was wondering what it would report on a SGI mips 4000 system.  
> Any takers out there?

If you give me some time, I'll download and run it on my Magnum 4000PC/50.

> [...]
> The above is just because I'm curious, the motherboard looks great, of
> course I'm dying for details.

Me too :-)

> Which Bus? Which video chip? Which scsi chip? Which simms? Interleaved?

Video chip: Inmos G33x - don't know if they are still using the 334.
Scsi chip: 53xx90 - don't know exactly.
Simms: 512Kx36 or 2Mx36 or even larger. 8 slots. 2way interleaved. 

> Guess I'll have to be patient.
> Anyone with any ties at SGI?  I've heard a fair amount about the announced
> reference designs, which sounds like a updated designs for the 4200.

I will send a reminder to the guy at MTI again. I'm sure
he's quite busy, so I can't bother him each day.

Cheers,
Andy

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