ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The figure is worked out by multiplying the number of Render Output Units by the the card's clock speed. Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to its local memory in one second - measured in millions of pixels per second. It is measured in millions of texels processed in one second. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). This number is worked out by multiplying the total texture units by the core speed of the chip. Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one 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, it must be multiplied by 2 once again. It's worked out by multiplying the bus width by its memory clock speed. Memory Bandwidth: Bandwidth is the maximum amount of data (counted in megabytes per second) that can be moved across the external memory interface within a second.
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