ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. Pixel rate is worked out by multiplying the amount of ROPs by the the card's clock speed. Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly record to the local memory in one second - measured in millions of pixels per second. It is measured in millions of texels processed per second. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). This is worked out by multiplying the total amount of texture units of the card by the core speed of the chip.
Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. It especially helps with AA, HDR and higher screen resolutions. The better the memory bandwidth, the better the card will be in general. If the card has DDR type RAM, the result should be multiplied by 2 once again.
It is calculated by multiplying the card's interface width by its memory clock speed. Memory Bandwidth: Memory bandwidth is the largest amount of information (counted in MB per second) that can be transported past the external memory interface in a second.
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