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 colour ROPs by the clock speed of the card. Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. It is measured in millions of texels applied in one second. The higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). This figure 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 number of texture map elements (texels) that can be processed in one second. It especially helps with AA, HDR and higher screen resolutions. The better the memory bandwidth, the better the card will be in general. In the case of DDR RAM, it must be multiplied by 2 again. The number is calculated by multiplying the interface width by its memory speed. Memory Bandwidth: Bandwidth is the maximum amount of information (in units of megabytes per second) that can be transported over the external memory interface in a second.
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