Microprocessor speed is an important issue. However, speed alone is not the only factor in performance appraisal. In order to evaluate the performance of the processor, the following factors must be considered. Clock Speed : The speed at which a microprocessor can perform interactions depends on its clock speed. Executing each instruction requires the CPU's fixed clock ticks ( or clock cycles). The faster the clock, the more instructions the CPU can execute per second. Floating Point Unit ( FPU): One of the most important measures of efficiency of a microprocessor is its efficiency in calculating floating points. This unit plays a very effective role especially in 3D games , 3D recording and graphics manipulation. Level 3 cache ( L3 cache): The L3 cache inside the chip plays a significant role in speed and size of memory. Multimedia Instruction ( Multimedia Instruction): All current microprocessors contain multimedia instructions that play a vital role for three-dimensional application software. Bus Speed: The speed at which Motherbird's chipset is capable of communicating with RAM and other devices, including the processor, is called frontside bus speed. The higher the bus speed of the processor, the more advanced the processor is considered.