Compare any two graphics cards:
GeForce 8400 GS 512MB vs Radeon HD 5450
IntroThe GeForce 8400 GS 512MB comes with a clock speed of 650 MHz and a DDR2 memory speed of 400 MHz. It also makes use of a 64-bit memory bus, and uses a 80 nm design. It features 16 SPUs, 8 Texture Address Units, and 4 ROPs.
Compare all of that to the Radeon HD 5450, which makes use of a 40 nm design. AMD has set the core speed at 650 MHz. The DDR3 RAM is set to run at a speed of 800 MHz on this specific card. It features 80(16x5) SPUs as well as 8 TAUs and 4 Rasterization Operator Units.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
The Radeon HD 5450 should in theory be much faster than the GeForce 8400 GS 512MB overall. (explain)
Texel RateBoth cards have the exact same texel fill rate, so in theory they should be equally good at at AF. (explain)
Pixel RateBoth cards have the exact same pixel rate, so theoretically they should perform equally good at at FSAA, and be able to handle the same screen resolutions. (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: Bandwidth is the maximum amount of data (counted in MB per second) that can be transferred across the external memory interface in one second. It is worked out by multiplying the bus width by its memory clock speed. If the card has DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.
Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied per second. This number is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the 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 chip could possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the the card's 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 is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.