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- Newsgroups: comp.sys.ibm.pc.hardware
- Path: sparky!uunet!mcsun!sun4nl!dutrun!donau!zen.et.tudelft.nl!wolff
- From: wolff@zen.et.tudelft.nl (Rogier Wolff)
- Subject: Re: Mixing 70 & 80 ns SIMMS in a 486?
- Message-ID: <1992Sep01.102306.4658@donau.et.tudelft.nl>
- Sender: news@donau.et.tudelft.nl (UseNet News System)
- Nntp-Posting-Host: zen.et.tudelft.nl
- Organization: Delft University of Technology, Dept. of Electrical Engineering
- References: <Jim_Johnson.078t@abcd.Houghton.MI.US> <1992Aug31.231945.5328@wuecl.wustl.edu>
- Date: Tue, 01 Sep 1992 10:23:06 GMT
- Lines: 47
-
- dale@manet.wustl.edu (Dale Frye) writes:
-
- >In article <Jim_Johnson.078t@abcd.Houghton.MI.US>
- >Jim_Johnson@abcd.Houghton.MI.US (Jim Johnson) writes:
- >> In a message dated Sat 22 Aug 92 16:25, Grund@pyrite.som.cwru.edu
- >(victor G
- >> wrote:
- >>
- >> GG> I have a Gateway 486/33 ISA which has 8 MB of 70 ns SIMMS. I have
- >> GG> a meg of 80 ns SIMMS around the house, and I'm wondering would be
- >> GG> possible
- >> GG> to add these to my system without risking ill-effects?
-
- One megabyte? Memory comes in chunks of 4Mb on most 486 machines: they
- have a 32 bit databus, and you need 4 simms to feed that.
-
- >>
- >> I don't recommend putting chips slower than the manufacturer recommends
- >> into a machine - nasty things can happen. I have only recently been
- >> hearing advice against putting RAM faster than the manufacturer
- right.
- >recommends
- >> into a machine, unless you make ALL the RAM faster. You won't see a
- >> performance increase with RAM faster than recommended by the way.
- wrong: you'd have to change setup parameters like "wait states" before
- performance increase becomes possible, however at 33Mhz, you'd need
- RAM that's 30ns faster than recommended before you can start thinking
- about lowering the number of waitstates by one. And even then you can
- not be sure it will work: other chips on the motherboard may be designed
- to use the extra waitstate for something or another.
-
-
- >In a word. W R O N G !!!!!!
-
- >As long as it's fast enough it doesn't matter how fast it is. You can mix
- >and match speeds to your heart's content as long as the speeds are fast
- >enough for the MB. You can mix and match speeds between banks and within
- >a bank. IT DOESN'T MATTER.
-
- Right.
-
- >Dale Frye
- >Washington University in St. Louis
- --
- If the opposite of "pro" is "con", what is the opposite of "progress"?
- (stolen from kadokev@iitvax.iit.edu, who got it from brydon@asl.sinet.slb.com)
- EMail: wolff@duteca.et.tudelft.nl ** Tel +31-15-783644 or +31-15-142371
-