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Old January 5, 2013, 03:48 PM
moocow moocow is offline
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The revision is a bump in maximum bandwidth.

Per wiki
PCI-SIG announced the availability of the PCI Express Base 2.0 specification on 15 January 2007.[17] The PCIe 2.0 standard doubles the transfer rate compared with PCIe 1.0 to 5 GT/s and the per-lane throughput rises from 250 MB/s to 500 MB/s. This means a 32-lane PCIe connector (32) can support throughput up to 16 GB/s aggregate.
PCI Express - Wikipedia, the free encyclopedia
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