Maxing out The Witcher 2 and getting a decent FPS could be quite expensive, due to the Ubersampling.
I'm using two 580s in SLI, a 4,7GHz I7 2600k, and 16 GB of 1600Mhz RAM, and the game still drops to around 30 FPS when there is a lot of vegetation on screen, but I'll get around 80 with...