A major change in the version 3.0 is in the voltage difference that distinguishes the ones and zeros being transferred across the PCI subsystem's electrical connections. The PCI 1.0, introduced in 1992, used 5-volt signaling technology, and version 2.0 added support for 3.3-volt technology that permits the PCI subsystem to run at faster speeds. Version 3.0 requires the 3.3-volt connections.
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