Cant enable sli

Solution
Yes, thats your problem...

1 x PCIe 3.0 x16, Support AMD Quad CrossFireX™, CrossFireX™

Use a 970 for physx i suppose have zero sense, too much power, gpu power, heat, etc... for use only in physx in a handfull of games that your main card could run also.
Yes, thats your problem...

1 x PCIe 3.0 x16, Support AMD Quad CrossFireX™, CrossFireX™

Use a 970 for physx i suppose have zero sense, too much power, gpu power, heat, etc... for use only in physx in a handfull of games that your main card could run also.
 
Solution