Pixel-pushing power
We've already talked about some of these numbers in our discussions of the individual cards, but let's put them all together and have a look at them in context. Pixel and texel (textured pixel) fill rates aren't as singularly important as they used to be, but they're still very relevant to overall performance in many applications. Texel fill rate, in particular, still matters quite a bit.

  Core clock
(MHz)		Pixels/
clock		Peak fill rate
(Mpixels/s)		Textures/
clock		 Peak fill rate
(Mtexels/s)		 Memory
clock (MHz)		 Memory bus
width (bits)		 Peak memory
bandwidth (GB/s)
Radeon X1600 XT5904236042360138012822.1
GeForce 6800 3258260012390070025622.4
GeForce 6600 GT5004200084000100012816.0
Radeon X80040012480012480070025622.4
GeForce 6800 GS42583400125100100025632.0
GeForce 6800 GT350165600165600100025632.0
Radeon X800 XL40016640016640098025631.4
Radeon X1800 GTO500126000126000100025632.0
GeForce 7600 GT56084480126720140012822.4
GeForce 6800 Ultra425166800166800110025635.2
GeForce 7800 GT400166400208000100025632.0
All-In-Wonder X190050016800016800096025630.7
Radeon X1800 XL500168000168000100025632.0
Radeon X850 XT520168320168320112025635.8
Radeon X850 XT PE540168640168640118025637.8
XFX GeForce 7800 GT450167200209000105025633.6
Radeon X1800 XT62516100001610000150025648.0
Radeon X1900 XT62516100001610000145025646.4
GeForce 7800 GTX4301668802410320120025638.4
Radeon X1900 XTX65016104001610400155025649.6
GeForce 7900 GT4501672002410800132025642.2
GeForce 7800 GTX 5125501688002413200170025654.4
GeForce 7900 GTX65016104002415600160025651.2

The GeForces have a clear edge in peak multitextured fill rate here, with the 7900 GT and GTX coming in ahead of the Radeon X1900 XTX in the theoretical numbers and in the synthetic texel fill rate test. Despite their similar die sizes, the Radeon X1600 XT has much less texturing capacity than the GeForce 7600 GT. Even the Radeon X1800 GTO has less.

Notice how, in the pixel fill rate test, the GeForce 7900 GTX comes in behind the 7800 GTX 512. I'd bet that's caused by the 7900 GTX's lower memory bandwidth.