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The type and number of CPUs dictate the performance potential of Microsoft Exchange Server. For example, computers based on the Pentium processor offer better performance than computers based on the 486 chip. Also, a 133 MHz Pentium performs better than a 100 MHz Pentium with a similar configuration. In general, computers with multiple CPUs offer better performance potential than computers with just one CPU; however, more processor power does not always result in increased performance. Upgrading a CPU or adding additional CPUs provides few benefits when other hardware resources, such as the I/O subsystem, are the sources of bottlenecks.