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From: tgoose@eng.umd.edu (Jason Garms)
Newsgroups: comp.sys.mac.hardware
Subject: Re: Can you mix SIMM speeds in one CPU?
Message-ID: <1991May22.193232.882@eng.umd.edu>
Date: 22 May 91 19:32:32 GMT
References: <1991May16.133437.1@gsbacd.uchicago.edu>
Sender: news@eng.umd.edu (C-News)
Reply-To: tgoose@eng.umd.edu (Jason Garms)
Organization: College of Engineering, Maryversity of Uniland, College Park
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In article <1991May16.133437.1@gsbacd.uchicago.edu>, gft_robert@gsbacd.uchicago.edu (opcode ranger) writes:
> I have a Mac II w/ 5 megs RAM: 4 1 MB SIMM's and 4 256k SIMMS.  The 1 MB SIMM's
> are 80 ns, I believe.  Can I go to 8 meg using slower SIMM's in the other 4
> sockets (that is, does it make any difference whether you use SIMM's of
> different speeds in the same machine, as long as they all meet the CPU's
> minimum requirement?)?
> 
> Any info much appreciated!
> 
> Robert

It is okay to put chips as slow as 120ns into a Mac II.  Just _try_ to keep
the speed of the chips in the same banks the same, i.e., use 4 100ns chips to
fill bank 2.  I have seen no problems however in mixing and matching different
speed SIMMs, but it is not recommended if it can be avoided.

Good luck,
-- 
Jason Garms
tgoose@eng.umd.edu