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Can i use a pci express 1.0 card in a pci express 2.0 x16 slot?

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http://superuser.com – I am runing out of sata connections and need to expand using a pci card, however, i only have a pci express 2.0 slot available, will a pcie 1.0 (pci express 1.0) expansion card work in a pci express 2.0 slot? (HowTos)