The main difference between the two is that the 386SX had a 16-bit data bus, while the 386DX had a full 32-bit data bus. This meant that it took twice as many cycles to transfer data across the bus, and limited the 386SX to a maximum of 16 MB of RAM, although it could still technically page up to 4 GB.
A 386SX processor has 16-bits and 386DX has 32-bits
The 386SX is a 32 bit processor running on a 16 bit bus.
The 386DX is a 32 bit processor running on a 32 bit bus.
Intel has released processor with a variety of bus / memory widths. The 386SX had a 16-bit data width, the 386DX and 486 had a 32-bit bus width, and the Pentium had a 64-bit data bus.
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386DX
386DX. Was that question from NCO 2009,IX class??
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