ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen.
The number is worked out by multiplying the amount of Raster Operations Pipelines by the the core clock speed. Pixel Rate: Pixel rate is the most pixels the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. It is measured in millions of texels in a second. The higher the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). This figure is calculated by multiplying the total amount of texture units by the core clock speed of the chip. Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This might be a strong point if your current power supply is not enough to handle the GeForce 9800 GT. It especially helps with AA, HDR and higher screen resolutions. Reasons to consider Radeon HD 5450: 106 watts lower power draw. Comparative analysis of NVIDIA GeForce GTX 460 OEM and ATI Mobility Radeon HD 2600 XT videocards for all known characteristics in the following categories: Essentials, Technical info, Video outputs and ports, Compatibility, dimensions and requirements, API support, Memory, Technologies. The better the card's memory bandwidth, the better the card will be in general. NVIDIA GeForce GTX 460 OEM vs ATI Mobility Radeon HD 2600 XT. If it uses DDR type RAM, the result should be multiplied by 2 again. It's worked out by multiplying the bus width by its memory clock speed. Memory Bandwidth: Memory bandwidth is the maximum amount of information (measured in MB per second) that can be transferred across the external memory interface in a second.
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