So after setting up my RX 480s in crossfire, it seems obs will show a black screen only when crossfire is enabled. I am also running a Xeon E5-2670 with 12 GB of ddr3, so normally I don't ever notice a drop in fps while recording that isn't within maragin of error.
Logs: http://pastebin.com/aX5QK0na
Logs: http://pastebin.com/aX5QK0na