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The PCI bus is an unterminated bus using either 3.3V or 5V signaling voltages.

Cards using PCI are keyed by slots in their edge connector to prevent plugging the card into a connector on a bus that expects signaling voltages that they are not compatible with.

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Q: How much voltage does the PCI bus use?
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What type of bus does a pci express use?

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When installing a device why would you prefer to use a pci expansion slot rather that an isa expansion slot?

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