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A local bus is one which is integrated into the computer. Typically, this includes the Frontside Bus (or Hypertransport in AMD), the Memory Bus, the PCI bus, the PCI Express Bus (if present), the AGP Bus (if present), and onboard peripheral busses such as IDE, SATA, USB, IR, Firewire, and many others.

Expansion buses are those which are not built in. For example, if you do not utilize onboard video, you would use a PCI, AGP, or PCI-E expansion bus to add video capabilities.

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Q: How are local buses different from expansion buses?
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