Compare any two graphics cards:
GeForce GTX 285 2GB vs Radeon HD 6950
IntroThe GeForce GTX 285 2GB features a GPU clock speed of 648 MHz, and the 2048 MB of GDDR3 memory is set to run at 1242 MHz through a 512-bit bus. It also features 240 Stream Processors, 80 Texture Address Units, and 32 ROPs.
Compare those specifications to the Radeon HD 6950, which features a core clock speed of 800 MHz and a GDDR5 memory frequency of 1250 MHz. It also features a 256-bit memory bus, and makes use of a 40 nm design. It is comprised of 1408 SPUs, 88 TAUs, and 32 Raster Operation Units.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
Theoretically speaking, the Radeon HD 6950 should perform a bit faster than the GeForce GTX 285 2GB in general. (explain)
Texel RateThe Radeon HD 6950 should be a lot (approximately 36%) more effective at anisotropic filtering than the GeForce GTX 285 2GB. (explain)
Pixel RateIf using a high resolution is important to you, then the Radeon HD 6950 is a better choice, by a large margin. (explain)
Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.
Memory Bandwidth: Bandwidth is the maximum amount of data (in units of megabytes per second) that can be transported over the external memory interface within a second. The number is calculated by multiplying the bus width by the speed of its memory. If it uses DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.
Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.
Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.