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From: philip@Kermit.Stanford.EDU (Philip Machanick)
Newsgroups: comp.sys.mac.hardware
Subject: Re: Apple is dumping 120ns SIMMS into SE/30s
Message-ID: <1990Feb3.235722.8344@Neon.Stanford.EDU>
Date: 3 Feb 90 23:57:22 GMT
References: <1990Feb3.161313.7380@mathrt0.math.chalmers.se>
Sender: news@Neon.Stanford.EDU (USENET News System)
Reply-To: philip@pescadero.stanford.edu
Organization: Computer Science Department, Stanford University
Lines: 18

In article <1990Feb3.161313.7380@mathrt0.math.chalmers.se>,
d6maca@dtek.chalmers.se writes:
> 
> Apple don't use parity checking, except on the IIci. BUT, can someone tell
> me why I can use 150ns memory in my MacII? (for over two years and no
problems)
> 
> - Martin Carlberg
> - Chalmers University of Technology, Gothenburg, Sweden
The speed rating of the RAM is an indication of expected reliability;
there's no widget inside the chip that says, "Hey, I'm being clocked too
fast", and turns on a fire alarm. Running 150ns RAM in a Mac II (or
SE/30) is like using a single density diskette as double density.
There's nothing to stop you doing it, but fear of pushing something
beyond/close to its maker's design tolerances.

Philip Machanick
philip@pescadero.stanford.edu