i5 3570k OC'd at 4GHz
8GB Ram
7970 + 7950 Crossfire
On the mission where you have the tower shooting bombs at you and you have to hide, my FPS drops when I'm looking at all the grass. My CPU usage is at 100% but both GPU's are only at about 50-60%. Everything is on Very High with FXAA on but there's a performance drop on all settings.
What's the problem?