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- Newsgroups: bionet.software
- Path: sparky!uunet!haven.umd.edu!darwin.sura.net!welchgate.welch.jhu.edu!oscar.welch.jhu.edu!ken
- From: ken@oscar.welch.jhu.edu (Ken Fasman)
- Subject: Re: PC 80486
- Message-ID: <1993Jan25.170138.10928@welchgate.welch.jhu.edu>
- Followup-To: bionet.software
- Keywords: microcomputer microprocessor Intel 486
- Sender: news@welchgate.welch.jhu.edu
- Nntp-Posting-Host: oscar.welch.jhu.edu
- Organization: Genome Data Base, Johns Hopkins School of Medicine
- References: <1993Jan25.090410.12066@gserv1.dl.ac.uk>
- Date: Mon, 25 Jan 1993 17:01:38 GMT
- Lines: 46
-
- In article <1993Jan25.090410.12066@gserv1.dl.ac.uk>, schnorr@tournesol.versailles.inra.fr (Kirk Schnorr) writes:
- |> I was wondering if anyone out there could inform me about the relative
- |> differences between the various flavors of 486 CPU chips in PC
- |> computers. We are about to buy a new system for data aquisition and
- |> proccessing for our HPLC to replace our slow and failing HP Vectra 286.
- |> We were thinking to get a 486SX based machine since it is the
- |> cheapest but I do not want to sacrifice a built in math co-proccessor
- |> or 32 bit data path it the 486SX is missing these. Can anyone enlighten
- |> me?
-
- My understanding of the various members of the Intel 80386 and 80486 families
- are as follows:
-
- Chip Internal External Floating
- Designation Data Path Data Path Point Unit?
- ----------- --------- --------- -----------
- 386DX 32 bits 32 bits No
- 386SX 32 bits 16 bits No
-
- 486DX 32 bits 32 bits Yes
- 486SX 32 bits 16 bits Yes
-
- Please note that Intel uses the "SX" designation to denote the narrower
- external data path, NOT the presence or absence of a math coprocessor.
-
- Intel has also introduced 486DX2 chips, which operate internally at double
- their external clock speed. For example, the 50 MHz 486DX2 runs internally
- at 50 MHz and externally (memory, local bus video, etc.) at 25 MHz.
-
- IBM has introduced the 386SLC and 486SLC chips, which I believe operate at
- lower power consumption and have other minor performance enhancements, but I
- have not seen actual confirmation of this, so please check on it.
-
- Intel is also getting ready to introduce 486 chips which consume less power,
- using a 3.3 Volt input. I do not know the official designation of these chips.
-
- I hope this helps a little bit. :-)
-
- Ken Fasman
- Deputy Director of Informatics
- Genome Data Base
- Johns Hopkins University School of Medicine
- 2024 E. Monument St.
- Baltimore MD 21205
-
- ken@library.welch.jhu.edu
-