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- From: kamp@ecf.toronto.edu (KAM PAUL PING-YAN)
- Newsgroups: comp.sys.ibm.pc.hardware
- Subject: Re: 3-chip vs 9-chip SIMMs?
- Keywords: DRAM memory SIMM obsolescence
- Message-ID: <BzFByq.BH9@ecf.toronto.edu>
- Date: 17 Dec 92 22:04:02 GMT
- References: <Bz9M37.I40@inews.Intel.COM> <2406@sdrc.COM>
- Organization: University of Toronto, Engineering Computing Facility
- Lines: 27
-
- In article <2406@sdrc.COM> scjones@thor.sdrc.com (Larry Jones) writes:
- >In article <Bz9M37.I40@inews.Intel.COM>, sthe@td2cad.intel.com (Siang-Chun The) writes:
- >> Which is the older technology: 3-chip SIMMs or 9-chip SIMMs?
- >
- >9 chip SIMMs are older. 3-chip SIMMs use one higher density chip instead
- >of 4 lower density chips (e.g. a 3-chip 1Mbx9 SIMM uses two 1Mbx4 chips
- >and one 1Mbx1 chip instead of using nine 1Mbx1 chips).
- >
- >> Are 3-chip SIMMs incompatible with 9-chip SIMMs?
- >
- >No, but there may be other compatibility problems. For example, 4Mb chips
- >have different refresh requirements than 1Mb chips so a machine that can't
- >refresh 4Mb chips correctly won't work with 3-chip 1Mx9 SIMMs. Generally
- >speaking, most machines shouldn't have any problem with 3-chip 256Kbx9
- >SIMMs and any machine that supports 4Mbx9 SIMMs should work with 3-chip
- >1Mbx9 SIMMs (although you may have to disable hidden refresh). I don't
- >think 3-chip 4Mbx9 SIMMs exist yet.
- >----
- >Larry Jones, SDRC, 2000 Eastman Dr., Milford, OH 45150-2789 513-576-2070
- >larry.jones@sdrc.com or ...uunet!sdrc!larry.jones
- >Oh yeah? You just wait! -- Calvin
-
-
- 3-chip 4Mbx9 SIMMs do exist. As a matter of fact, I've been using them for
- more than half a year.
-
- - Paul
-