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Modern serial expansion architecture
PCI Express is a modern industry standard sponsored by the Peripheral Component Interconnect Special Interest Group (PCI SIG). Because older parallel technologies placed multiple devices on a single bus, the slowest device determined the speed of the entire bus. A serial technology, PCI Express guarantees each device dedicated bandwidth to and from the system controller.
PCI Express communicates in 250-MBps “data lanes.” PCI Express cards and slots are defi ned by their bandwidth, or number of data lanes—typically one lane, four lanes, eight lanes, or 16 lanes. At 250 MBps per lane, a four-lane slot can transfer data at up to 1 GBps and an eight-lane slot, up to 2 GBps—approximately twice as fast as a 133MHz PCI-X slot.
Technology Overview
Power Mac G5
Three expansion slots
In addition to the 16-lane graphics slot, the Power Mac G5 features three PCI Express expansion slots: two four-lane slots and one eight-lane slot. Each slot uses a standard connector that can accommodate a card of any size. This means a four-lane card works perfectly in an eight-lane slot. If the card has more lanes than the slot, the card adjusts to the bandwidth available and “downshifts” to that data rate.
With the high-bandwidth architecture in the new Power Mac G5, your system not only will achieve faster performance today, but will be ready for future technologies as well. For example, 10-gigabit networking technology, which can achieve up to 2.5 GBps of data throughput, will require an eight-lane slot. This promises to be an ideal solution for working with uncompressed HD video, which demands over 120 MBps per individual stream—and far more in a multiple-stream or multiple-camera environment.
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