Compare any two graphics cards:
GeForce 8400 GS 512MB vs GeForce 9500 GT DDR2
IntroThe GeForce 8400 GS 512MB features a core clock speed of 650 MHz and a DDR2 memory speed of 400 MHz. It also makes use of a 64-bit bus, and makes use of a 80 nm design. It features 16 SPUs, 8 Texture Address Units, and 4 ROPs.
Compare those specifications to the GeForce 9500 GT DDR2, which has a core clock speed of 550 MHz and a DDR2 memory speed of 500 MHz. It also makes use of a 128-bit memory bus, and makes use of a 65 nm design. It is comprised of 32 SPUs, 16 TAUs, and 8 ROPs.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
The GeForce 9500 GT DDR2, in theory, should be quite a bit faster than the GeForce 8400 GS 512MB in general. (explain)
Texel RateThe GeForce 9500 GT DDR2 will be a lot (more or less 69%) more effective at anisotropic filtering than the GeForce 8400 GS 512MB. (explain)
Pixel RateThe GeForce 9500 GT DDR2 should be much (about 69%) faster with regards to full screen anti-aliasing than the GeForce 8400 GS 512MB, and will 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 (measured in megabytes per second) that can be moved over the external memory interface in a second. It's calculated by multiplying the interface width by its memory clock speed. If the card has DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.
Texel Rate: Texel rate is the maximum 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 clock 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 applied per second.
Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also 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, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.