Compare any two graphics cards:
GeForce GT 420 vs Radeon HD 3470 512MB
IntroThe GeForce GT 420 comes with core speeds of 700 MHz on the GPU, and 900 MHz on the 2048 MB of GDDR3 memory. It features 48 SPUs along with 8 TAUs and 4 Rasterization Operator Units.
Compare those specs to the Radeon HD 3470 512MB, which has a clock frequency of 800 MHz and a GDDR3 memory speed of 950 MHz. It also uses a 128-bit bus, and uses a 55 nm design. It features 40(8x5) SPUs, 4 TAUs, and 4 Raster Operation Units.
Power Usage and Theoretical Benchmarks
The Radeon HD 3470 512MB should in theory perform a little bit faster than the GeForce GT 420 overall. (explain)
Texel RateThe GeForce GT 420 should be a lot (about 75%) faster with regards to texture filtering than the Radeon HD 3470 512MB. (explain)
Pixel RateThe Radeon HD 3470 512MB should be a little bit (more or less 14%) better at FSAA than the GeForce GT 420, and also 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 max amount of information (measured in MB per second) that can be transported over the external memory interface in a second. It is worked out by multiplying the card's interface width by its memory speed. If it uses DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, 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 processed in one second. This number is calculated by multiplying the total number of texture units of the card 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 applied in one second.
Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the clock speed of the card. 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 fill rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.