2nd Video Card not showing in the Device Manager

I have a z77 sabertooth and 2 direct cu graphics cards and im unable to get the 2nd one to work i have updated everything and i have tested the cards on there own and they both work i cant see anything in the bios to enable to make the card work i have the onbord graphics card showing up in device manager so im hoping someone here may know what i need to do.
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  1. also like to add there both GTX 560 direct CU but one is a GTX 560 direct CU SE will that make a difference ??
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