The actual pixel rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The number is worked out by multiplying the amount of Render Output Units by the the card's clock speed. Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly record to the local memory in one second - measured in millions of pixels per second. It is measured in millions of texels in a second. The better the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). This number is worked out by multiplying the total amount of texture units by the core speed of the chip. AMD Radeon R6 M340DX vs NVIDIA GeForce GTX 275 Comparative analysis of AMD Radeon R6 M340DX and NVIDIA GeForce GTX 275 videocards for all known characteristics in the following categories: Essentials, Technical info, Video outputs and ports, Compatibility, dimensions and requirements, API support, Memory, Technologies. Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. It especially helps with AA, HDR and higher screen resolutions. The higher the bandwidth is, the faster the card will be in general. If the card has DDR type RAM, it should be multiplied by 2 again. It is calculated by multiplying the card's bus width by the speed of its memory. Memory Bandwidth: Bandwidth is the largest amount of information (in units of megabytes per second) that can be moved over the external memory interface within a second.