you like to repeat yourself?
yes they are the same.
they are the same.
the are the same.
some cards clock better than others.
but they have they same g71 core.
The cores used in the 7950 are cherry picked, specifically selected cores. Therefore, the difference between the two cores is OC potential. If you still cannot follow it, i suggest you read up on manufacturing GPU cores and yields. The 7900GTX and the 7950GTX do not have the same OC potential.