32 bits wide
For the Pentium the front side data bus is 64 bits wide. The back side is 32 bits wide.
32 bit
The external data bus can be as wide as desired, given the necessary compromises between performance, complexity, and cost. The wider the bus, the faster the theoretical aggregate data transfer rate. In the 8085 and 8088, the external data bus is 8 bits wide; in the 8086, it is 16 bits wide; in the 80386, it is 32 bits wide; and in the modern incarnations of 64 bit processors, it is 64 bits wide.
The address bus in the 8085 is 16 bits wide.
64
the data bus is only 8 bits wide but most buses today are much wider: 16, 32, 64, or 128 bits wide.
You need 20 bits of address bus to address 1 Mb of memory.
64 bits wide
16
8
A 386SX processor has 16-bits and 386DX has 32-bits