7870s work better with crossfire disabled

Indyanon17

Honorable
Nov 9, 2013
6
0
10,510
I have two 7870s in crossfire. When cf is enabled games like cod ghost, crysis 3, bf4 have choppy cutscenes and sometimes gameplay. However when cf is disabled they run flawlessly. Any ideas why and what I can do to fix would be awesome. specs are all stock.
MSi 990fxgd80v2 mobo
amd fx 8350
Corsair 16gb 1600mhz memory
2x msi 7870 hawk edition
corsair 1050w psu
2tb 7200rpm seagate hd