Compare any two graphics cards:
GeForce 8800 GT 1GB vs Radeon HD 5670
IntroThe GeForce 8800 GT 1GB makes use of a 65 nm design. nVidia has clocked the core frequency at 600 MHz. The GDDR3 RAM runs at a speed of 900 MHz on this particular model. It features 112 SPUs as well as 56 TAUs and 16 ROPs.
Compare those specifications to the Radeon HD 5670, which uses a 40 nm design. AMD has clocked the core speed at 775 MHz. The GDDR5 memory is set to run at a frequency of 1000 MHz on this particular card. It features 400(80x5) SPUs along with 20 Texture Address Units and 8 Rasterization Operator Units.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
As far as performance goes, the Radeon HD 5670 should in theory be a little bit better than the GeForce 8800 GT 1GB in general. (explain)
Texel RateThe GeForce 8800 GT 1GB is a lot (about 117%) better at anisotropic filtering than the Radeon HD 5670. (explain)
Pixel RateThe GeForce 8800 GT 1GB will be a lot (more or less 55%) better at AA than the Radeon HD 5670, and also should be capable of handling higher resolutions more effectively. (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 maximum amount of data (in units of megabytes per second) that can be moved across the external memory interface within a second. It is worked out by multiplying the bus width by its memory speed. If it uses DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.
Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This figure is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one 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 calculated by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.