i dont think theres any problem with putting a PCI express 2 graphics card into a pci express 1 slot and vise versa. there will be a bit of a performance hit with PCI-E 1 and a 2 graphics card....but its not a huge deal and the graphics card will work fine. so as long as your mobo has a PCI-E X16 slot in it...your good to go. if your not sure then check the manual if you have it or have a look at the manufacturers website.
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