Source : Free On-Line Dictionary of Computing

Intel 80386SX
     
         A lower-speed version of the {Intel 80386}.  It
        uses a 16-bit data bus instead of a 32-bit data bus.  It has a
        24-bit {address bus}.  It is faster than the 286, and more
        importantly, like the full-size 386, provides more flexibility
        in running existing DOS applications.  Intel's version runs at
        16 MHz, while {AMD}'s can run at up to 33 MHz.  It comes in a
        {PFP} package.
     
        (2003-07-05)