Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!utgpu!water!watmath!clyde!rutgers!labrea!decwrl!sun!rainier!dchen
From: dchen@rainier.UUCP
Newsgroups: comp.sys.mac
Subject: Re: SIMM RAM for the MacII
Message-ID: <27042@sun.uucp>
Date: Tue, 1-Sep-87 20:59:13 EDT
Article-I.D.: sun.27042
Posted: Tue Sep  1 20:59:13 1987
Date-Received: Thu, 3-Sep-87 04:26:09 EDT
References: <20389@ucbvax.BERKELEY.EDU> <2085@ihlpf.ATT.COM>
Sender: news@sun.uucp
Lines: 21
Summary: memory margin shaving

In article <2085@ihlpf.ATT.COM>, stuart@ihlpf.ATT.COM (Stu Ericson) writes:
> In article <20389@ucbvax.BERKELEY.EDU>, korn@cory.Berkeley.EDU (Peter "Arrgh" Korn) writes:
> [a nice intro about SIMM RAM speeds needed for Mac II]
> > So, it seems that 150ns DRAMs are perfectly kosher for a MacII.  When
> > I get a chance, I'll run some timing benchmarks, and re-post those
> > findings.
> 
> [point made that these memories are being run faster than rated]
> So its not just *DO* they work, but HOW RELIABLY.  How does one test that?
	Well, what I've seen done is burn hardware in either a) slightly
faster than it's intended to be run (kick your crystal up to 18 MHz or such).
Doesn't seem too likely on a Mac II.  The b) option, which I might
do myself if I didn't want to spend the bucks, is to burn those memories in
at some elevated temperature (shut off the fans, or (much safer
to your Mac) build an envelope to cover the SIMMs in question).
This generates some margin in MOS, because MOS tends to run slower
at elevated temperatures.
	This is not recommended for the nervous;  nobody's going
to listen if you blow up your Mac II and cry.

Disclaimer:  That includes me.