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Compare any two graphics cards:
GeForce GTX 285 1GB vs GeForce GTX 470
IntroThe GeForce GTX 285 1GB features a clock frequency of 648 MHz and a GDDR3 memory speed of 1242 MHz. It also makes use of a 512-bit bus, and makes use of a 55 nm design. It is comprised of 240 SPUs, 80 Texture Address Units, and 32 ROPs.
Compare all that to the GeForce GTX 470, which uses a 40 nm design. nVidia has set the core speed at 607 MHz. The GDDR5 memory runs at a speed of 837 MHz on this specific model. It features 448 SPUs along with 56 Texture Address Units and 40 ROPs.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
The GeForce GTX 285 1GB, in theory, should perform a bit faster than the GeForce GTX 470 overall. (explain)
Texel RateThe GeForce GTX 285 1GB is a lot (about 53%) faster with regards to AF than the GeForce GTX 470. (explain)
Pixel RateThe GeForce GTX 470 will be a bit (more or less 17%) better at FSAA than the GeForce GTX 285 1GB, and also capable of handling higher screen resolutions while still performing well. (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 data (in units of megabytes per second) that can be transported past the external memory interface in a second. It's calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the 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 texture map elements (texels) that are processed per second. This number is worked out by multiplying the total number of texture units by the core speed of the chip. The better this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.
Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to the local memory in a second - measured in millions of pixels per second. The figure 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 output rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.