home *** CD-ROM | disk | FTP | other *** search
- Xref: sparky comp.sys.ibm.pc.hardware:22444 sci.electronics:14738
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!n8emr!bluemoon!bp1742!bytehead
- From: bytehead@bp1742.UUCP (Bryan Price)
- Newsgroups: comp.sys.ibm.pc.hardware,sci.electronics
- Subject: Re: What is the difference between DX and SX?
- Message-ID: <RVTVPB2w165w@bp1742.UUCP>
- Date: Fri, 21 Aug 92 20:29:26 EDT
- References: <TNXuPB4w165w@bluemoon.rn.com>
- Organization: Burning Point, Columbus OH 43229-5646
- Lines: 55
-
- 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.co
- > > >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..........................
-