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From: lindh@uhasun.hartford.edu (Andrew Lindh)
Newsgroups: comp.sys.dec
Subject: Re: Can a DECstation replace a 11/750 ?
Summary: Yes....and No
Message-ID: <55@ultrix.uhasun.hartford.edu>
Date: 5 May 90 03:46:27 GMT
References: <36119@prls.UUCP> <5070@hub.ucsb.edu> <38515@mips.mips.COM>
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In article <38515@mips.mips.COM>, rogerk@mips.COM (Roger B.A. Klorese) writes:
> In article <1990May4.025422.8656@spock.UUCP> eric@spock.UUCP (Eric Volpe) writes:
> >In article <5070@hub.ucsb.edu> aks@somewhere.ucsb.edu (Alan Stebbens) writes:
> >>
> >>The DS3100 really runs at 15 MIPS, which is *fifteen* times faster than a 
> >>VAX/780.
> >It is *not* *fifteen* times faster than a vax 780! the DS3100 is a RISC
> >machine, meaning Reduced Instruction Set - Which means that each instruction
> >on a RISC processor is very small and the equivalent of several instructions
> >of a non-RISC processor. So, while it may be true that the DS3100 can
> >execute fifteen times as many of its instructions in one second as a VAX780
> >can of vax instructions, you're comparing apples and oranges. Each Vax
> >instruction accomplishes perhaps the equivalent of eight DS3100 instructions.
> 
> ........ 
> Of course, the only meaningful system benchmark is your own actual 
> workload.
> 

Yes it can replace a 750....in some cases...
The CPU may be able to get more done, but there is more to a VAX than just
the raw CPU speed.  Yes it may blow away a 750 if you are doing a lot of
number crunching with a small number of users. But I don't think that
the disk are other equipment is as fast. But I do know our new 6320 is 
faster than our old 780. At 40 or 50 users it (6320) is still faster
than 20 people on a 780...and the 6320 has 6Mips vs. 3Mips (780)
(here we are back to the MIPS stuff....but they are the same CPU)

As an example (Non DEC stuff)....I was looking at the new Sun SparcStations
and the new IBM RT/6000 stuff. The IBM had a faster CPU but it seemed
to be a MUCH slower machine in terms of the user interaction and graphics IO.
--
Andrew Lindh, a student at the University of Hartford -- Computer Science
BITNET:    LINDH@HARTFORD.bitnet       INTERNET: lindh@uhasun.uofh.edu
UUCP/Usenet: lindh@evecs.uucp	---- When will I grduate???
NOTE: All views here are MINE!!! Not the schools or thoes of anyone else!