Compare any two graphics cards:
GeForce 8400 GS 512MB vs GeForce 9500 GT DDR2
IntroThe GeForce 8400 GS 512MB features a clock frequency of 650 MHz and a DDR2 memory speed of 400 MHz. It also uses a 64-bit memory bus, and makes use of a 80 nm design. It features 16 SPUs, 8 Texture Address Units, and 4 ROPs.
Compare all of that to the GeForce 9500 GT DDR2, which comes with a core clock speed of 550 MHz and a DDR2 memory frequency of 500 MHz. It also uses a 128-bit memory bus, and uses a 65 nm design. It features 32 SPUs, 16 TAUs, and 8 ROPs.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
Performance-wise, the GeForce 9500 GT DDR2 should in theory be a lot better than the GeForce 8400 GS 512MB in general. (explain)
Texel RateThe GeForce 9500 GT DDR2 should be quite a bit (about 69%) faster with regards to AF than the GeForce 8400 GS 512MB. (explain)
Pixel RateIf running with a high screen resolution is important to you, then the GeForce 9500 GT DDR2 is the winner, by far. (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 information (measured in megabytes per second) that can be moved over the external memory interface within a second. It's calculated by multiplying the interface width by its memory clock speed. If the card has DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better 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 can be applied in one second. This figure is worked out by multiplying the total number of texture units by the core speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.
Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.