Compare any two graphics cards:
Radeon HD 3470 256MB vs Radeon HD 3650 512MB
IntroThe Radeon HD 3470 256MB uses a 55 nm design. AMD has set the core frequency at 800 MHz. The DDR2 memory runs at a speed of 950 MHz on this specific card. It features 40(8x5) SPUs as well as 4 Texture Address Units and 4 ROPs.
Compare all that to the Radeon HD 3650 512MB, which has a GPU core clock speed of 725 MHz, and 512 MB of GDDR3 memory running at 800 MHz through a 128-bit bus. It also is made up of 120(24x5) Stream Processors, 8 TAUs, and 4 Raster Operation Units.
Power Usage and Theoretical Benchmarks
The Radeon HD 3470 256MB should theoretically perform a little bit faster than the Radeon HD 3650 512MB in general. (explain)
Texel RateThe Radeon HD 3650 512MB is quite a bit (more or less 81%) better at AF than the Radeon HD 3470 256MB. (explain)
Pixel RateIf using a high screen resolution is important to you, then the Radeon HD 3470 256MB is the winner, though only just barely. (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 max amount of information (measured in megabytes per second) that can be moved past the external memory interface in a second. It is calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.
Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This is worked out by multiplying the total texture units of the card by the core clock 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 processed in one second.
Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka 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, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.