ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The number is worked out by multiplying the amount of colour ROPs by the clock speed of the card. Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second.
It is measured in millions of texels in a second.
The higher this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). This figure is calculated 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 in one second. It especially helps with anti-aliasing, HDR and higher screen resolutions. The better the bandwidth is, the faster the card will be in general. If the card has DDR type RAM, it should be multiplied by 2 again. It is calculated by multiplying the card's interface width by its memory speed. Memory Bandwidth: Memory bandwidth is the largest amount of data (in units of megabytes per second) that can be moved past the external memory interface within a second.
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