Is it okay if my psu supports pcie 2. 0 then my video card is pcie 3 0

is it okay if my psu supports pcie 2. 0 then my video card is pcie 3. 0
btw my videocard is 7870 and my psu is enermax infiniti 720w
one more question: where sould i get the extra 6pins cause the psu has 6+2pins should i use the molex :??:
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  1. yes. the only cpu series that even supports pci-e 3.0 is ivy bridge and sandy bridge-express so it wouldn't even matter. my 7850 runs on a pci-e 3.0 slot at 2.0 lane speeds due to using an i3-2120

    as for the 6 pins, you should already have 2 6 pins and 1 6+2 pins. use any combination of the 2 to power up the gpu.
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