Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. It is measured in millions of texels processed in a second. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). This is calculated 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 memory bandwidth, the faster the card will be in general.
If it uses DDR memory, it should be multiplied by 2 once again. It is calculated by multiplying the card's bus width by its memory speed. Memory Bandwidth: Bandwidth is the largest amount of data (measured in megabytes per second) that can be moved across the external memory interface in a second.
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