So I originally purchased a Zotac GTX 970 and have been loving it. Decided to buy a second one, same exact model, to try SLI. When I couldn't get SLI to work I thought it might be the SLI bridge but just to be safe I pulled out my first card and put my new second card into the main slot. This brand new card is now running at PCIe 3.0 x4 for some reason, even under load. My original runs at x16 no problem in the exact same slot. I've never heard of anything like this happening before, but if I had to guess this is why running in SLI isn't possible. Do I somehow just have a bad card?