PCI 2.1

hi,
in some product i see pci 2.1.like xfx 5870 or sapphire.what is the diffrence with pci 2.0.what is changing in graphic card.and does exist and mainbord that support pci 2.1?
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  1. Wikipedia has a good explanation of PCI-e, 1.0, 2.0, 2.1, and 3.0, and the increases in full-duplex data transfers. Using google, and mfrs.' (ASUS, Gigabyte, MSI, and DFI) sites, I could not find any motherboards with PCI-e 3.0.
  2. i said 2.1 not 3!!amd 890 fx is the last chipset on mainbord .that all mainbord doesn't have this feature.ok.thanks.
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