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Fillrate Investigation

Besides, 3DMark 2001SE we also decided to undertake a little investigation of the fillrate speed by FIC R96P and GeForce FX 5600 Ultra with the help of a special benchmark. This test draws a polygon on the screen and then there are from 0 to 4 textures to be laid onto it with 512x512 pixels big. In the first case, that is when there are 0 textures to be laid, the color of the pixel is calculated as interpolation of polygon vertex colors. This program tests the graphics card in three modes. So, here comes the first mode: color writes enabled, Z-writes also enabled:

As you see, the result is pretty common: since FIC R96P based on RADEON 9600 PRO  features 4 pipelines with 1 TMU on each, it spends an extra clock to process any new texture. It means that the fillrate drops down almost evenly. And GeForce FX 5600 Ultra suffers a sharp performance hit, when there are two textures laid, so that it goes even beyond FIC R96P. this happens because of the 2x2 mode (2 pipelines with 2 TMUs on each).

And now let’s disable Z-writes:

The result is almost the same. Now let’s enable the Z-writes and disable the color-writes:

In this case the textures cannot be laid at all that is why all the testing participants almost reach their  theoretical performance maximum. The winner this time is FIC R96P.

 
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