I'm on 2 4gb GTX 680's running SLI with an i7 3930K and yet The Witcher 2 still seems to run sluggish for the most part. Is this normal or is there something wrong with my system. Every other game I've tried runs at a constant 60fps including Crysis 2 with the DX 11 and high res addon. Yet, my PC seems to struggle to even run the witcher 2 at 30fps. Is this normal?