CPU Hardware Connections Pins Pads CPU Buses Memory Data Bus Memory Address Bus Front Side Bus (fsb) Back Side Bus(bsb) Cache L1-primary cache L1 d -holds program data L1 i-holds instructions for microproccesor L2-secondary cache L3-last level cache Clock System crystal Clock wire CPU Speed System bus speed x multiplier Speed units Mhz Ghz CPU Architecture 32bit(x86) 64bit(x64)