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- Newsgroups: comp.sys.ibm.pc.misc
- Path: sparky!uunet!cs.utexas.edu!torn!watserv1!watmath!undergrad.math.waterloo.edu!leibniz.uwaterloo.ca!ychung
- From: ychung@leibniz.uwaterloo.ca (Young Chung)
- Subject: Re: 386-40 VS i486SX-25
- Message-ID: <Bs5unt.GDB@undergrad.math.waterloo.edu>
- Sender: news@undergrad.math.waterloo.edu
- Organization: University of Waterloo
- References: <1992Jul27.023833.4565@techbook.com> <1992Jul29.113033.12000@monu6.cc.monash.edu.au>
- Date: Wed, 29 Jul 1992 17:16:39 GMT
- Lines: 47
-
- In article <1992Jul29.113033.12000@monu6.cc.monash.edu.au> kevinlu@yoyo.cc.monash.edu.au (Kevin Lu) writes:
- >: >
- >: > I beleive he meant that it is acceptable to take the cut in CPU power
- >: >(whatever it might be *cough*), and purchase some extra RAM with the money
- >: >you would have had to spend on the 486SX/25. I did it myself and I am
- >: >happy with my AMD 386/40. Memory is memory... aye?!
- >: >
- >: >-Rob
- >: >reward@eos.ncsu.edu [.sig on vacation also]
- >:
- >: Cut in CPU power? From My understanding... a 486 is a 386 with an onboard
- >: 387 and cache. A 486sx is a 486 that has the 387 disabled, leaving you
- >: with what is basically a 386 with a cache.
- >: Now, this means he's comparing a 386 40Mhz with a 386 25Mhz with a cache.
- >: I leave the decision as to which is better up to y'all...
- >
- >
- >Thats not right is it?
- >
- >The 486 has different timings (via clock cycles) and there for runs faster
- >(not by much) than a 386. Also there are some newer functions on the 486
- >(albeit partially useless ones). However i would stay away from an SX,
- >because if you want the co-pro. part, Don't you have to buy a chip which
- >is in fact a '486 which disable your SX chip?
- >
- >
- >
-
- As far as I know, ALL x87SX chips have their corresponding x87SX chip (including
- the 486SX). And, yes and no on 486 being 386 with 387 and all. I think that
- the architecture of 486 and 386 are a bit different. For instance, I think
- the 486's use 64-bit instruction set(?), this means faster 32-bit integer
- calculations. This implies that 486SX/25 will run faster than 386/33 in most
- cases. I guess
- my last point would depend on how much faster is 64-bit calculation compared
- to 32-bit. I used PMFract, Fractint for OS/2, under OS/2 2.0. The 32-bit
- version of PMFract worked about 1.5 times faster than the 16-bit version
- regardless of what I was doing in the background or forground sessions.
-
-
-
- -------------
- How long do those Energizers last anyway?
- I don't know, I have rechargables.
- ============================================================================
- Young --:#) ychung@descartes.waterloo.edu
- ============================================================================
-