What is meant by the BUS speed of the processor/motherboard

it is the speed at which the motherboard talks to its peripherals.The north bridge takes care of the RAM,hard disks andthe south bride controls the PCI slots and extra attachments

Bus is any data carring path. There aer two buses acting as the life line of the computer one being the CPU bus(internal bus of cpu connecting ALU, registers and Control unit inside CPU) and the other being the FSB(Front Side Bus). FSB connects mainly the CPU, main memory i.e. RAM and the I/O controller. This is a very brief of what FSB connects. It also connects the graphics card, the interrupt controll and so many things; keeping them appart. BUS speed usually is the clock speed of the bus. Clock is a time intervel during which a device works. I think this is enough for you to understand what the bus is and what the speed of the bus means. If you want more contact me.....

Front Side Bus Speed The speed of the bus that connects the processor to the main memory(RAM). As processor have become faster and faster, the system bus has become one chief bottleneck in modern PCs. Typically bus speed are 400MHz, 533MHz, 667MHz and 800MHz. A bus is a path where the data or instruction travel from memory to be executed by processor. Hope it can help you..

this will be a difficult one, but basically its the speed at which the processor communicates with the northbridge of the motherboard, it also depends a lot on what type of processore you are using. like for instance in an AMD CPU the bus speed is merely a multiplier for the speed coz it uses the HT link instead. it is also related to the speed of the system memory

a bus is a subsystem that transfers data or power between computer components inside a computer or between computers and typically is controlled by device driver software. a bus can logically connect several peripherals over the same set of wires.