EVGA_MatthewH
EVGA Rep
A GTX 580 Ultra is not a real NVidia SKU, it's just EVGA's term for a 3GB, overclocked card. It won't perform significantly differently than a GTX 580, certainly nowhere near 6950 2GB CFX.
The classified ultra actually has an improved PCB, PWM, Fan, and is binned for higher overclocks. Its our own design with a 580 binned GPU. The 3GB 580 Superclocked is what you are referring to.