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- Xref: sparky comp.sys.ibm.pc.hardware:22452 sci.electronics:14746
- Newsgroups: comp.sys.ibm.pc.hardware,sci.electronics
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!n8emr!bluemoon!gerry
- From: gerry@bluemoon.rn.com (Gerard M. Foley)
- Subject: Re: What is the difference between DX and SX?
- Message-ID: <BPVXPB3w165w@bluemoon.rn.com>
- Sender: bbs@bluemoon.rn.com (BBS Login)
- Organization: Blue Moon BBS ((614) 868-998[024])
- References: <RVTVPB2w165w@bp1742.UUCP>
- Date: Sat, 22 Aug 92 23:03:58 EDT
- Lines: 63
-
- bytehead@bp1742.UUCP (Bryan Price) writes:
-
- > gerry@bluemoon.rn.com (Gerard M. Foley) writes:
- >
- > > ntaib@silver.ucs.indiana.edu (Iskandar Taib) writes:
- > >
- > > > In article <1992Aug15.185130.24702@wyvern.twuug.com> asoper@wyvern.twuug.
- > > > >sehari@iastate.edu (Babak Sehari) writes:
- > > > >
- > > > >>---
- > > > >>What is the difference between a DX and a SX specification for 386 and
- > > > >>486?!
- >
- > ...stuff deleted...
- >
- > > I believe the 386SX has only eight data lines, in place of
- > > 16 in the 386DX, and 486SX has no operable mathematics coprocessor,
- > > while 486DX has an on-chip math floating point coprocessor
- > > equivalent to the 80387.
- >
- > Hello Gerry! :)
- >
- > The 386SX has 16 data lines, in place of the 32 data lines that the
- > DX has. Also, the 386SX only has 24 address lines, whereas the 386DX
- > has 32 address lines, which means that the 386SX can only address 16
- > megs of memory, while a 386DX can address up to 4 gigs.
- >
- > The 486SX is a (purposefully) damaged 486DX so that the floating
- > point is inoperative, the 487SX is a normal 486DX with a different
- > pin-out that is to be used in the feature slot. With the 487SX, you
- > can toss the 486SX, as it totally replaces it.
- >
- > The 486DX2 is a 486DX with a clock multiplier builtin to make
- > internal machinations occur twice as fast as they normally would.
- > This gives you an increase in performance without an increase in the
- > cost of the support circuitry. This chip is fully pin-compatible and
- > replaces any existing 486DX. There fore, a company can design a
- > 33MHZ 486DX system, and with the change of a chip (and a heat sink,
- > the chip get's extremely hot) can then sell it as a 66MHZ system.
- > Currently, the only OverDrive chips as Intel calls them are for DX
- > systems, so trying to run a 486DX2 in a machine that has a 486SX,
- > just ain't going to work. Intel obviously has the technology to do
- > it, it's a matter of whether they will or not.
- >
- > ObPeeve: I personally am a little fed up with these various "options"
- > that Intel is trying to pander to the public. The 486SX broke a lot
- > of programs that assumed that once they were running on a 486, they
- > would have floating point. Now, various options to not have an
- > internal cache, and who knows what else they'll cook up, will
- > probably be pawned off on the public. They'd have done the world a
- > favor had they made the 386SX pin compatible with the '286.
- >
- > Bryan L. Price | [ bytehead@bp1742.UUCP ] *Burning Magnesium*
- > <Why would I make | [ {n8emr|nstr}!bluemoon!bp1742!bytehead]
- > my disc any laimer?> | [ Bryan.Price@p1742.f340.n226.z1.FIDONET.ORG ]
- >
- > All trademarks are owned by their respective owners..........................
-
- Believe Bryan Price, not me.
-
- This is from
- gerry@bluemoon.rn.com
- who doesn't have his (or her) own obnoxious signature yet
-