Difference between pci x16 and 2.1

I have an ASUS motherboard (Model: - P5KPL-AM/PS).It has a PCI Express x16 slot. Can i plug in the Radeon 5770 with this which has PCI Express x16 2.1??? Please help me as i am very confused about it.
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  1. yes. there are an infinite number of threads about this, learn to search. even google would return you with your answer.
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