Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly write to the local memory per 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 figure is worked out by multiplying the total 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 can be processed per second. It especially helps with anti-aliasing, HDR and high resolutions. The better the bandwidth is, the better the card will be in general.
If it uses DDR RAM, the result should be multiplied by 2 again. The number is calculated by multiplying the bus width by the speed of its memory. Memory Bandwidth: Bandwidth is the max amount of data (counted in megabytes per second) that can be transferred across the external memory interface in one second.
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