What is a 2.1 in the description of a pci-e grapic s card referring to?

I am looking at a replacement pci-e card for a m2n-sli motherboard. In the description for it, a gigabyte gv-r 687 OC-1GD Radeon card HD 6870, it refers to pci-e 2.1 . Will it work on my slightly old mother board?
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More about what description grapic card referring
  1. It refers to the version of PCI-e x16 it has. It's the transfer speed and systems involved in the slot.

    1.0 has a transfer rate of 2.5GT/s, 250mbps data rate.
    2.0 has a transfer rate of 5.0GT/S, 500mbps data rate
    2.1 has the same speed as 2.0, with technologies being incorporated into 3.0
    3.0 has a transfer rate of 8.0GT/S, and one of the technologies is removing the 20% overhead that was on 2.0, so it effectively doubles the transfer rate of 2.0.

    which motherboard do you have?
  2. yes, they will be fine.
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