Is pci-e 2 1 compatable with pci-e 2 0

i got a biostar (TA790GX A3+ Ver. 5.x) t-force bord it has 2 psi-e 2.0 with crossfire. can i use a card with a 2.1 interface?
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  1. It is compatible the only issues reported have been with older PCIe 1.x motherboards.
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