Compare any two graphics cards:
GeForce GTX 285 1GB vs GeForce GTX 480
IntroThe GeForce GTX 285 1GB makes use of a 55 nm design. nVidia has set the core frequency at 648 MHz. The GDDR3 memory is set to run at a frequency of 1242 MHz on this particular card. It features 240 SPUs along with 80 Texture Address Units and 32 Rasterization Operator Units.
Compare those specs to the GeForce GTX 480, which comes with a core clock speed of 700 MHz and a GDDR5 memory frequency of 924 MHz. It also features a 384-bit memory bus, and makes use of a 40 nm design. It is made up of 480 SPUs, 60 TAUs, and 48 ROPs.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
The GeForce GTX 480 should theoretically be a bit faster than the GeForce GTX 285 1GB overall. (explain)
Texel RateThe GeForce GTX 285 1GB will be quite a bit (approximately 23%) faster with regards to anisotropic filtering than the GeForce GTX 480. (explain)
Pixel RateThe GeForce GTX 480 is quite a bit (about 62%) better at FSAA than the GeForce GTX 285 1GB, and also capable of handling higher 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 largest amount of data (counted in MB per second) that can be transported past the external memory interface in one second. It is calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.
Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This figure is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.
Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.