For the most part it appears that Dragon Age II is primarily GPU dependent. Any current Core i3, i5, i7 or Phenom II processor will be sufficient to get the most out of your graphics card. Even the old Core 2 Quad performed well. Keep in mind we are using the Radeon HD 6990 to remove a potential GPU limitation, so there will be even less of a margin when using slower graphics cards.
The only processors to show some signs of weakness were the Core 2 Duo and Athlon II. It also doesn't appear that quad-core processors are essential as the Phenom II X2 560 performed very well in our test.