Compare any two graphics cards:
Geforce GTX 780 vs Radeon HD 5870
IntroThe Geforce GTX 780 features a GPU core speed of 863 MHz, and the 3072 MB of GDDR5 RAM runs at 1502 MHz through a 384-bit bus. It also is comprised of 2304 SPUs, 192 Texture Address Units, and 48 Raster Operation Units.
Compare all that to the Radeon HD 5870, which uses a 40 nm design. AMD has clocked the core speed at 850 MHz. The GDDR5 RAM is set to run at a speed of 1200 MHz on this specific card. It features 1600(320x5) SPUs along with 80 TAUs and 32 Rasterization Operator Units.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
In theory, the Geforce GTX 780 should be 88% faster than the Radeon HD 5870 in general, due to its greater bandwidth. (explain)
Texel RateThe Geforce GTX 780 should be much (more or less 144%) better at texture filtering than the Radeon HD 5870. (explain)
Pixel RateThe Geforce GTX 780 will be much (about 52%) better at FSAA than the Radeon HD 5870, and also should be capable of handling higher screen resolutions without slowing down too much. (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 largest amount of data (counted in megabytes per second) that can be transported across the external memory interface within a second. The number is worked out by multiplying the card's interface width by its memory clock speed. In the case of DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.
Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This number is calculated by multiplying the total amount of texture units by the core speed of the chip. The higher the texel rate, the better the graphics 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 per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.