PC Wont Detect Second GPU

[useffff]

So I have this PC right now for just a little mining rig, these are old parts. So I have two R7 250 2GB GPUs. I have them plugged into a Z97-A MOBO that has 2 PCIE 16 Slots. Now when I open up Nicehash, it only detects 1 GPU. Now the problem is that even when I open up Device Manager, its grayed out saying that its not connected. I have reinstalled the AMD drivers multiple times and I have swapped each GPU to make sure they both work. Now I dont know if this is a problem, but if I try to even put just one GPU in the second or third PCIE 16 slot, it will turn on and spin the fans and all, but it wont show a image and thats for both cards in both slots. Can someone please help me figure this out? The GTX 1080 is my primary GPU that I dont have installed because I am testing this out on this machine, I made sure to uninstall the Geforce Drivers. ALSO THIS IS NOT MEANT TO PLAY GAMES OR CROSSFIRE, BUT FOR MINING!