The X1950 XTX nearly gives the 7950 GX2 a run for its money. Only at the higher resolutions with AA/AF does the highest-end GeForce really start to pull away from the X1950 XTX, which maintains a slight but consistent lead over the X1900 XT.
Far Cry
Here we see the X1950 XTX with a 3 - 9 FPS lead over the X1900 XT, with the 7950 GX2 still up ahead -- but again not so much that the extra cost involved can be justified.