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PCIe 3.0 will transfer data at 8GT/s, PCI-SIG

The PCI-SIG (Special Interest Group), which controls the PCI spec, announced the finalization of the transfer rate for the upcoming PCI-Express 3.0 specification, currently expected to debut in late 2009 or 2010. PCIe 3.0 will transfer data at a rate of 8GT/s, but unlike PCIe 2.0 or PCIe 1.1, will not require devices to pay a 20 percent bandwidth overhead cost.

Up until now, PCI-SIG has used GT/s as a unit of measurement for PCIe bandwidth, rather than the more familiar Gb/s. GT stands for GigaTransfers per second, and differs from the standard unit of measurement due to PCI-Express’ 8bit/10bit encoding system. Put simply, PCIe 1.1 and 2.0 use 10 bits of encoding to send 8 bits of data. This, in turn, results in theoretical peak transfer rates that are only 80 percent as fast as the number typically expressed by the group in GigaTransfers per Second.

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PCI-SIG, PCIe 3.0, Data Transfer Rate, 8GT/s, PCI, PCI-Express 3.0, Bus, Interface, Motherboard, Hardware

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