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- Path: sparky!uunet!gatech!prism!gt7080a
- From: gt7080a@prism.gatech.EDU (Nathan I. Laredo)
- Newsgroups: comp.sys.intel
- Subject: Re: 486sx questions
- Keywords: 486sx, A20 line
- Message-ID: <64705@hydra.gatech.EDU>
- Date: 30 Jul 92 19:51:06 GMT
- References: <1992Jul27.135047.13578@nstn.ns.ca> <76814@ut-emx.uucp>
- Organization: Georgia Institute of Technology
- Lines: 39
-
- In article <76814@ut-emx.uucp> ifaq570@ccwf.cc.utexas.edu (Allen Kitchen) writes:
- >
- > Sorry bud, but to upgrade from the 486SX to the 486DX, you will
- >need to buy an entire new motherboard. Reason for this is that the SX is
- >a 16 bit memory bus, just like the 386. The DX is a 32 bit part, meaning
- >the memory is set up to be 32 bits wide. Since the memory width is not
- >changable, you will need a new motherboard. Save your memory though. You
- >can never have too much memory, or disk space.
- > A good analogy would be 'how do I upgrade my 4 cylinder engine to 8
- >cylinders ?'.
-
- I usually don't reply to messages of this nature, but SHEESH! You're
- giving sutdents at the university of texas a bad image. No, it is possible
- to upgrade your processor to a 486DX if your motherboard supports it.
- Most of the less-expensive 486WB OPTi motherboards have jumper settings
- to allow you to use anywhere from a 486SX-20 to a 486DX-50 on the same
- board. Please check with your dealer for more information on your
- particular motherboard. The 486SX is NOT 16 bits... it's a true 32
- bit chip, with the 8k on chip cache, as well as all the other features
- of the 486DX, only it runs at a slower clock and has the math coprocessor
- missing or disabled (depending on what intel now does).
-
- You might check to see if there are extra jumpers around the socket for
- the 486. If your motherboard only has a slot for a weitek math coprocessor,
- there's a good chance that it will support the processor upgrade since
- there's no slot for a 487. Motherboards that have this feature are usually
- near the bottom of the scale with prices for a 33MHz 486DX board running
- around $569 now. The cache on these boards usually starts at 64k and is
- upgradable to 256k only. The manual for these motherboards is skimpy
- and has a red glossy cover. You should look for these features if your
- dealer is uncooperative.
-
- -Nathan I. Laredo
- -Georgia Institute of Technology, Atlanta, Georgia
- --
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