The second test is satisfied with a lower fill rate but puts a heavier load on the GPU’s vertex processors. The ASUS Extreme N7800GTX TOP isn’t slower than the RADEON X1800 XT even in 1024x768. The ASUS card is slower than the RADEON X1800 XT in the “eye candy” mode, but the gap hardly amounts to 4-5%.
The third and the most complex test produces a similar picture, but the difference between the ASUS Extreme N7800GTX TOP and the reference GeForce 7800 GTX is much smaller in the “eye candy” mode than before: 1-2fps (or 5%) against 20% in the second and third tests. This can be explained by a higher textural load in the scene – the scene has open landscapes and complex materials that realistically simulate the surface of the cliffs and water.
As you have seen, the lower 3DMark05 score of the ASUS Extreme N7800GTX TOP comes from this card being slower than the RADEON X1800 XT in low resolutions for some reason. In higher resolutions, however, these two graphics cards have similar performance, even when full-screen antialiasing is enabled.