Petaflops are rarely used to measure a single computer's performance, since only the fastest supercomputers run at more than one petaflops. Therefore, petaflops are more often used when calculating the processing power of multiple computers. Also, since FLOPS only measures floating point calculations, petaflops is not necessarily a good indicator of a computer's overall performance. Other factors, such as the processor's clock speed, the system bus speed, and the amount of RAM may also affect how quickly a computer can perform calculations.