ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The figure is worked out by multiplying the number of ROPs by the clock speed of the card. Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to the local memory in a second - measured in millions of pixels per second. It is measured in millions of texels processed in one second. The better the texel rate, the better the video 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 anti-aliasing, High Dynamic Range and high resolutions.
The better the card's memory bandwidth, the faster the card will be in general. If it uses DDR RAM, it must be multiplied by 2 again. It is worked out by multiplying the card's bus width by the speed of its memory. Memory Bandwidth: Bandwidth is the max amount of information (counted in megabytes per second) that can be moved across the external memory interface in one second.
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