32 bit
32 bits wide
For the Pentium the front side data bus is 64 bits wide. The back side is 32 bits wide.
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
There is no latest AGP bus. The most recent bus designed for high performance equipment is PCI-E. And x16 has the highest bandwidth.
PCI Express
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.
PCI-E
Video Card