Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!att!cbnewsh!wcs
From: wcs@cbnewsh.ATT.COM (Bill Stewart 201-949-0705 ho95c.att.com!wcs)
Newsgroups: comp.sys.att,u3b.tech
Subject: Re: MIPS Rating of 3B2/400??
Message-ID: <3802@cbnewsh.ATT.COM>
Date: 12 Sep 89 01:02:19 GMT
References: <10305@attcan.UUCP>
Reply-To: wcs@cbnewsh.ATT.COM (Bill Stewart 201-949-0705 ho95c.att.com!wcs)
Distribution: na
Organization: News Busters
Lines: 29

In article <10305@attcan.UUCP> hjespers@attcan.UUCP (Hans Jespersen) writes:
]>Does anyone know the MIPS rating of the 3B2/400?  Thanks.
]My marketing guide says 1.5 MIPS.

It shouldn't say that, unless MIPS are more inflated in Canada :-)
I think the commonly-used numbers are something like 
	300	.7 MIPS (long since expired)
	310,400	1.1	(10 MHz)
	3B15	1.5	(14 MHz)
	3B2/500	2.1	(without optional VCACHE)
	3B2/600	2.6	(VCACHE is standard)
	3B2/700	4-5
	/1000	faster

These seem to be reasonable numbers, at least for "Microvax MIPS";
it's hard to compare multiuser performance of a 3B2/400 using ST506
disks against a VAX/780 that's had the RM05's replaced with Eagles.
As with any UNIX box, you do need enough memory, especially with
slow disks.  I'm pretty sure SCSI is available for the 310/400.

There are companies out there that will replace the 10 MHz chips in
310s and 400s with 14 MHz, which works in most machines, if you
don't mind running them above rated speed and remember to get the
right shape chip packages.  It's certainly worth getting the MAU
(floating point chip) if you don't have one.
-- 
# Bill Stewart, AT&T Bell Labs 4M312 Holmdel NJ 201-949-0705 ho95c.att.com!wcs
# often found at 201-271-4712 tarpon.att.com!wcs Somerset CP3-4C423 fax469-1355
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