The revision is a bump in maximum bandwidth.
Per wiki
Quote:
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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.
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PCI Express - Wikipedia, the free encyclopedia