So I did test it with gtx 770, I used fraps to watch the FPS
They vary too much depending on the distance and speed of moving things. Let's say it was 30-40 for me, but I would say its 20-50.
The range and changing factors are too big to determine anything measurable. Subjectivly with human eye.
In the 3D window, with the whole house paning fast left-right-up-down I get the same 30-40 depending on distance to the object and numbers of polys to draw. The front glass windows gives me closer to 30fps, the whole house 35.
But here is something I was doing before:
I was drawing a Roof on a concert hall, here is the gpu usage:
I see no difference in the use of any of the card. So there is no quaranty that a fast card will bring me improvements.
The system is not even trying hard. When I loop a opengl file in C4D the GPU usage is 100% and it uses OpenGL like Archicad I think.[/img]