Pixel rate is worked out by multiplying the number 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 its local memory per second - measured in millions of pixels per second. It is measured in millions of texels applied per second. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). This is worked out by multiplying the total texture units by the core speed of the chip. Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second.
It especially helps with AA, High Dynamic Range and high resolutions. The better the card's memory bandwidth, the better the card will be in general.
If it uses DDR RAM, it should be multiplied by 2 once again.
It is worked out by multiplying the bus width by its memory speed. Memory Bandwidth: Bandwidth is the maximum amount of data (counted in megabytes per second) that can be moved over the external memory interface within a second.
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