- How up to date are your graphics drivers?
- What version of directX do you have?
- What are you using to benchmark? (I'm assuming the counter in-game after you take control of your character)
- In the launcher, have you tried running with all of the different driver options? (Usually 2 or 3)
- Have you tried setting the fog distance using the console or options file? (Given that you have a 560, polygons shouldn't be an issue, but you should check anyway)