ATI Radeon X1650 Pro vs NVIDIA GeForce 6800 GT AGP

Even so it has lower graphics clock rate, the NVIDIA GeForce 6800 GT AGP comes with substantially better pixel fill rate, owing to 4 times as many ROPs (Raster Operations Pipelines). Having higher pixel fillrate allows the graphics card to draw more pixels on screen and off screen, which is beneficial for some 3D effects in games, or when playing at higher display resolutions.

Although its graphics clock is slower, the GeForce 6800 GT AGP has 4 times as many Texture Mapping Units (TMUs), which results in much better texture fill rate. Better texture fill rate means that the graphics card can utilize more complex 3D effects and/or map more textures to each texel, which improves visual appearance of games and generated images.

Memory bandwidth parameter tells how much memory (in Gigabytes) the graphics card can read from or write to dedicated memory per second. Cards with higher memory bandwidth have better performance at high display resolutions, or when using large and detailed textures, and/or utilizing complex 3D effects and filters, like anti-aliasing. The bandwidth is dependent on memory type, speed, and memory interface width. In this case, the NVIDIA GeForce 6800 GT AGP graphics card offers higher clocked memory of better kind, and wider bus interface. As such, it has more memory bandwidth.