On the motherboard, you have the processor, ram, northbridge, southbridge, and other controllers. Your processor usually has a 64-bit wide bus, although older processors have a 32-bit wide bus. The PCI slots usually run at a clock at 33 or 66 mhz. The PCI bus is 32-bit wide and on older motherboards, the ISA bus was 8 and 16-bit wide. You usually gain performance the wider the bus. On a 64-bit processor, you can use more than 4 gb or ram, which tends to make your pc faster. I hope this helps. I have lots of personal experience with computers!
