Compare any two graphics cards:
Radeon HD 5770 vs Radeon HD 6950
IntroThe Radeon HD 5770 features a clock frequency of 850 MHz and a GDDR5 memory speed of 1200 MHz. It also features a 128-bit bus, and makes use of a 40 nm design. It features 800(160x5) SPUs, 40 TAUs, and 16 Raster Operation Units.
Compare that to the Radeon HD 6950, which uses a 40 nm design. AMD has set the core speed at 800 MHz. The GDDR5 memory is set to run at a speed of 1250 MHz on this specific card. It features 1408 SPUs along with 88 Texture Address Units and 32 Rasterization Operator Units.
(No game benchmarks for this combination yet.)
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
Performance-wise, the Radeon HD 6950 should in theory be quite a bit superior to the Radeon HD 5770 overall. (explain)
Texel RateThe Radeon HD 6950 is much (approximately 107%) more effective at anisotropic filtering than the Radeon HD 5770. (explain)
Pixel RateThe Radeon HD 6950 is much (more or less 88%) better at full screen anti-aliasing than the Radeon HD 5770, and should be capable of handling higher screen resolutions without slowing down too much. (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 (in units of MB per second) that can be moved across the external memory interface in one second. The number is worked out by multiplying the interface width by its memory speed. In the case of DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.
Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This is calculated by multiplying the total amount of texture units of the card 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 in one second.
Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.