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From: jdevoto@Apple.COM (Jeanne A. E. DeVoto)
Newsgroups: comp.sys.mac.hardware
Subject: Re: Apple is dumping 120ns SIMMS into SE/30s
Message-ID: <38323@apple.Apple.COM>
Date: 4 Feb 90 05:56:33 GMT
References: <1990Feb3.161313.7380@mathrt0.math.chalmers.se>
Organization: Apple Computer Inc, Cupertino, CA
Lines: 21

In article <1990Feb3.161313.7380@mathrt0.math.chalmers.se>
d6maca@dtek.chalmers.se (Martin Carlberg) writes:
> [...]                                                 BUT, can someone tell
>me why I can use 150ns memory in my MacII? (for over two years and no problems)

When a chip is marked 150 ns, it means the chip is certified for at least
that speed. Some parts may actually be faster; fast enough to work at 120 ns.

HOWEVER, it's not a good idea to use them at less than their rated speed,
unless you feel lucky. A chip may work at 120ns in favorable conditions
early in its lifetime, only to fail at the higher speeds later on. With RAM
prices so low, I'd suggest anyone who is using low-speed parts should
seriously consider replacing them. Even if you haven't had trouble yet,
why take a chance?
-- 
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