I was not expecting this at all!!!
In almost every single benchmark I have seen, nvidia cards were equal if not better than their AMD counterparts and considering that this game used Nvidia game works it even more mind boggling how AMD got the upper hand, not to mention the stupendously good framerates overall.
What's weird is that I'm using an R9 290 in my rig and in FC3 the frame rate is mostly 60 but it almost never gets over 70. So how does it run better in FC4?!, plus many people with AMD cards are complaining about low framerates in FC4. I'll just have to wait and see by my self.