Find out the best settings for your CPU and GPU. Some pretty solid recommendations for settings to get the most out of the game with your system.
http://www.techspot.com/review/405-the-witcher-2-performance/

Thanks, shame they didn't include the 5XXX generation ATI cards though.

No SLI or Crossfire comparisons either.

Interesting detail I noticed: AMD cards seem to be better at high resolutions, nVidia rules suppreme at low resolutions.

This game has made me consider replacing my 3 year old 3850 (which runs perfectly at low specs) with a more modern 6850. If I want to see Ultra specs (without Ubersampling, obviously, but I don't see any meaningful difference in their comparison screenshot anyway), the 6850 looks like a very good buy.

It'd be the first time in my life a game has made me buy a new video card, but I'm not sure it's really worth it. Low specs still looks awesome. Does Ultra really add that much more?