Just got a new gaming computer with a Sapphire 6870. On Crysis on very high in 1080p with 2xAA I only get 20-30fps. In benchmarks and online I have seen others that get 30-40fps constant. Why is my fps so low? Also, it is very irregular. So if I look one way I get 40fps then when I start moving I get 20fps. Why is this? I'm downloading patch 1.2 to see if this helps, no idea how to install it (bit of a noob).