What is means of x16 pci-express slot

Hello,
what is means of x16 pci express slot .i know it is graphics slot but what means of x16
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More about what means express slot
  1. That means there 16 lanes.

    as opposed to 8 or 4.
  2. http://en.wikipedia.org/wiki/PCI-E

    PCI-E was created in 2004.
    Each lane provided 250 MB/s. 16 lanes, the maximum on a single PCI-E bridge (slot), equal 4 GB/s.

    However, since 2007, it was revised and edition 2 came out and was called PCI-E 2.0.
    The main difference was DOUBLING speed; each lane now provided 500 MB/s, so the total speed u get on a single PCI-E 2.0 bridge is 8 GB/s.

    PCI-E 3.0 is coming out soon; again, bandwidth has been doubled to 1 GB/s per lane, for a total of 16 GB/s per PCI-E 3.0 bridge.

    Go here for more info:-
    http://en.wikipedia.org/wiki/PCI-E#PCI_Express_2.0
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