Number of processors (cores) - a single chip with 2 or more processors where multiple instructions can be executed at the same time, increasing the overall speed of the processor, Width of Data Bus - increasing this results in more bits transferred between the processor and main memory in a read or write operation, Cache - an area of fast access memory either between the processor and main memory or on the processor chip itself. Holds frequently accessed instructions, Clock Speed - increasing this means that more memory reads/writes happen per second and so increases the amount of data being processed per second,

H Computer Systems - Factors affecting system performance

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