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Lesson 11. Peripherals > Using Additional Buses

Using Additional Buses

Mac OS X supports several other buses for connecting a wide variety of peripherals, including video cards, audio cards, and internal and external hard drives.

PCI and PCI-X

Peripheral Component Interconnect (PCI) cards are expansion cards that are installed inside desktop computers after turning off power. Because of their very high throughput compared to the plug-and-play connection buses, PCI cards are often used to add display capabilities, hardware RAID, or high-end analog video capture and compression. PCI cards are available to add a SCSI bus as well as additional USB and FireWire buses. PCI supports bus speeds up to 66 MHz, and PCI-X supports bus speeds up to 133 MHz. Note that PCI buses are present even in Macintosh models that lack slots, such as the iBook and PowerBook.


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