Compare any two graphics cards:
GeForce GTX 280 vs Radeon HD 6970
IntroThe GeForce GTX 280 comes with a GPU clock speed of 602 MHz, and the 1024 MB of GDDR3 RAM is set to run at 1107 MHz through a 512-bit bus. It also is made up of 240 SPUs, 80 Texture Address Units, and 32 Raster Operation Units.
Compare all of that to the Radeon HD 6970, which makes use of a 40 nm design. AMD has clocked the core frequency at 880 MHz. The GDDR5 memory runs at a frequency of 1375 MHz on this specific card. It features 1536 SPUs along with 96 TAUs and 32 ROPs.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
In theory, the Radeon HD 6970 will be 24% quicker than the GeForce GTX 280 overall, because of its greater data rate. (explain)
Texel RateThe Radeon HD 6970 is quite a bit (about 75%) better at texture filtering than the GeForce GTX 280. (explain)
Pixel RateIf using a high resolution is important to you, then the Radeon HD 6970 is superior to the GeForce GTX 280, and very much so. (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.
Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.
Memory Bandwidth: Memory bandwidth is the max amount of data (in units of MB per second) that can be transported over the external memory interface within a second. The number is worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.
Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied per second. This number is calculated by multiplying the total texture units by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.
Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.