Figure 11.8 shows that a typical computer system is interconnected with a number of different buses, both internal and external. The diagram includes multiple cache buses, an external CPU bus, PCI-Express buses, a parallel PCI bus, SATA buses, USB ports, and more. What are the advantages of providing multiple buses rather than connecting everything together with a single bus?

Figure 11.8

Cache Cache CPU CPU memory memory core core External External bus unit bus unit External CPU bus PCI-Express Graphics processing unit Memory bridge (Northbridge) Main Display memory SATA buses Wi-Fi DVD Disk controller PCI-Express Hard Network disk 1/0 bridge (Southbridge) interface USB port controller USB ports Ethernet PCI bus Cache sng Cache bus