Bus width

The width of a bus is the number of bits it can transfer at a time. For example, if a bus is 64 bits wide, it can transfer 64 bits of data at a time - usually every processor clock cycle.

Performance impact

If the address bus and data bus are wider, the processor can access more memory and transfer more data at a time, which can improve performance. For example, a 64-Bit data bus can transfer twice as much data as a 32-Bit data bus in the same amount of time.