PCI Express and PCI Express 2.0?

Is PCI Express and PCE Express 2.0 are same, i mean do the have same slot, i'm planning on buying a new video card, my old one was just PCI Express, now all Video cards comes with PCI Express 2.0 i believe, is PCI Express 2.0 compatible with just PCI Express..? Will PCI Express 2.0 Cards run on PCI Express... show more Is PCI Express and PCE Express 2.0 are same, i mean do the have same slot, i'm planning on buying a new video card, my old one was just PCI Express, now all Video cards comes with PCI Express 2.0 i believe, is PCI Express 2.0 compatible with just PCI Express..? Will PCI Express 2.0 Cards run on PCI Express slot..?

My motherboard us Asus 15KPL-AM/PS...
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