sean2109 :
Iceman21 :
Yes, its because of your cpu. I think 3th gen i3's lacks pci 3.0 support. There is not much performance difference between 2.0 and 3.0 so its not a problem at all.
Thanks, do you think it is worth upgrading my CPU for the extra GPU performance?
Given that the GPU is a mid-range card, you're fine with PCIe 2.0.
Now if you had a a GTX 1080, you'd want that PCIe 3.0.