EVGA GeForce 7800 GT CO vs NVIDIA GeForce 7800 GTX

The maximum pixel fillrate is calculated as the number of ROPs (Raster Operations Pipelines), multiplied by graphics frequency. The EVGA GeForce 7800 GT CO has a small lead here, as it runs at higher rate, and both cards have the same number of ROPs. Better pixel fill rate allows more pixels to be drawn on screen per second, which results in increased performance, unless there are bottlenecks in other areas, such as texture fillrate, CPU speed or memory bandwidth.

Although its graphics frequency is lower, the NVIDIA GeForce 7800 GTX GPU comes with more TMUs (Texture Mapping Units), which results in higher texture fill rate. Having better maximum texture fill rate allows the card to apply more textures and/or utilize more sophisticated 3D effects for each textured picture element, which improves games visual appearance.

 

To speed up processing, the GPUs store 3D scene data, textures and intermediate data, used for image generation, in on-board memory. The video memory usually has much higher bandwidth than system RAM, and more bandwidth allows the graphics unit to run at higher display resolutions, use larger and more detailed textures, and apply more complex 3D effects and filters. The bandwidth is dependent on a few components, like memory type, speed, and memory interface width. In this case, the NVIDIA GeForce 7800 GTX offers higher clocked memory. As a consequence, it has higher memory bandwidth.