I finally got a successful boot into El Capitan with my Graphics Card in the 5th slot. All other slots froze at PCI configuration. I had a successful two gpu setup in mavericks (the OS I upgraded from). If I install the GPU in slots 1 or 3. I can get past everything and then it hangs at the Missing Bluetooth Transport Controller part. It will then go to a blank screen. I'm going to test by using a remote viewer to see if the system is actually booting, but I would be willing to bet no.
Now,...
Need help adding Second GTX 980 Ti
Now,...
Need help adding Second GTX 980 Ti