There is a bug causing bad performance with most 5 & 6 series AMD cards. According to posts on rage3d/steam forums a new driver will be out this week to fix it.
On affected cards, you'll notice ~30-50fps outdoors no matter how quick your card is and what settings you use. For example I get 30-50fps on a 6990 no matter whether I use ultra or low settings. My friend on a single GTX570 on ultra gets ~80fps.
There are guys on the other forums with 2x6990s or 1x6990+6970 all getting 30-50fps outdoors![]()
Thanks for that mate thats put my mind at ease thinking it was actually my setup causing the issue. Hopefully there will be a driver update like they promise sometime this week just a waiting game i guess