6970 LOW FPS?

[onthemour]

I bought amnesia on prerelease and played as soon as it came out. Best horror game I have ever played. I played it on my old i5/5850 crossfire set up on single screen 1920x1080. It had good fps on high settings with vsync on. Now I am trying to play the dlc and will want to do the whole game over but I am having troubles with fps.

I upgraded a few minus ago to a 2600k/6970. It runs at 4.5ghz and 960/1540 stock volt. I have eyefinity 5670x1080 and it runs smooth on high without vsync but screen tear is horrible. When I turn on vsync it lags like crazy. Even on 1920x1080 low settings it lags with vsync! My system is much more powerfull than my old i5/5850. Is it lagging due to the 6970 and the drivers? I have tried d3doverider and ccc vsync but they also kill the fps. Do I need to reinstall the game? I got it off of steam do I need to use a cracked version? Does anyone have any ideas?

I love this game and really want to play it again