The figure is calculated by multiplying the number of ROPs by the the card's clock speed. Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write 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 higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). This number is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. It especially helps with AA, HDR and higher screen resolutions. The better the card's memory bandwidth, the faster the card will be in general. If the card has DDR type memory, it should be multiplied by 2 again. It is worked out by multiplying the interface width by its memory speed. Memory Bandwidth: Memory bandwidth is the largest amount of data (in units of MB per second) that can be moved over the external memory interface in one second.
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