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What is PC-66, PC-100, and PC-133?

These are common Bus speeds used in PCs.

PC-66 runs at 66 MHz, the clock speed of the bus between the CPU and the memory, or Front-Side Bus as it is called.

PC-100 is a faster main memory bus, transferring data at 100MHz. PC-100 represents about a 50% theoretical improvement in speed.

PC-133 runs at the bus speed of 133MHz giving an even more pronounced increase in speed.