NVIDIA GeForce GTX 550 Ti
Switching to Warsow and its distinct Qfusion game engine, the Radeon HD 6770 was over 20% faster than the GeForce GTX 550 Ti and at about the same frame-rate as the GeForce GTX 460.
There were some issues with Lightsmark on the Catalyst driver used, but for reference on the NVIDIA side, the GeForce GTX 460 was 20% faster than the overclocked GeForce GTX 550 Ti.
The rest of these tests are from the wonderful Unigine Engine tests. With the old Unigine Sanctuary demo running at 2560 x 1600, the Radeon HD 6770 was just 4 FPS (about 12%) faster than the Radeon HD 6770 and the GeForce GTX 460 was 25% faster than the Fermi graphics card under the microscope today.