Gamespot has made a hardware performance guide for NWN 2. Covering settings, image quality, graphics and memory/cpu usage, it gives the user good advice about maximizing the experience.
Here's a portion:
Neverwinter Nights 2 will enthrall you with a compelling storyline and addictive gameplay, but trying to enable all the best settings could hinder your gaming experience. Neverwinter Nights 2 is a performance-guzzling monster. Quite a few game settings brought our powerful test system to a screeching halt. If you crank up all the options, you will smother your player and enemy character models in an excessive amount of lighting and shadowing effects. Combat effects and those five torches stuck on the wall add even more performance demands. We had to break out the very best PC components to run the game well, and we still had a tough time keeping frame rates up when we increased the game settings.
We tested Neverwinter Nights 2 using FRAPs and a 25-second demo in the Blacklake district of the city of Neverwinter. We couldn't test in combat situations because fight sequences are very difficult to reproduce, but we believe that the Blacklake district is a fairly challenging area of the game. The game has a built-in V-sync frame rate cap that we couldn't disable. Most frame rates sat below the cap, but we did hit the limit in certain tests. Unlike first-person shooters, where you might need in excess of 60 frames per second for great gameplay, role-playing games like Neverwinter Nights 2 still play very well at a consistent 30 to 40 frames per second.
