In article <1993Jan25.090410.12066 at gserv1.dl.ac.uk>, schnorr at 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
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. :-)
Deputy Director of Informatics
Genome Data Base
Johns Hopkins University School of Medicine
2024 E. Monument St.
Baltimore MD 21205
ken at library.welch.jhu.edu