I have the 660ti and I'm looking to upgrade because I'm looking to do nVidia surround, but this card is the best I've owned to date. With an i7-3770k I manage to maintain the highest settings at 1080p on all games and achieve 60fps with the exceptions of:
Heavily modded Crysis (particles, textures, objects and foliage)
Heavily modded Skyrim (lighting, textures, objects, foliage, shadows, water)
These games still get between 40 and 60 FPS, and only drop in spots hard to process. Borderlands 2, 1080p, with max settings including Physx rarely drops below 70 fps!!! Great card, great upgrade.