why there is a shift from parallel to serial bus in pcie?

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There is parallel bus for pci and serial bus for pcie. Why parallel bus cannot be used for pcie but are using serial bus? why there is shift to serial bus for pcie?

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Akihito KIRISAKI On

Parallel bus is hard to be fast because of synchronizing signals per clock. Parallel signals must be sent synchronously. On the other hand, serial bus can send signals asynchronously, so is easy to be fast.