Compare any two graphics cards:
GeForce 8800 GTX vs GeForce 8800 Ultra
IntroThe GeForce 8800 GTX features a GPU core clock speed of 575 MHz, and the 768 MB of GDDR3 memory runs at 900 MHz through a 384-bit bus. It also is comprised of 128 SPUs, 64 TAUs, and 24 Raster Operation Units.
Compare those specs to the GeForce 8800 Ultra, which features GPU core speed of 612 MHz, and 768 MB of GDDR3 RAM set to run at 1080 MHz through a 384-bit bus. It also features 128 SPUs, 64 Texture Address Units, and 24 Raster Operation Units.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
In theory, the GeForce 8800 Ultra is 20% faster than the GeForce 8800 GTX overall, because of its greater bandwidth. (explain)
Texel RateThe GeForce 8800 Ultra is a little bit (approximately 6%) better at texture filtering than the GeForce 8800 GTX. (explain)
Pixel RateIf using a high resolution is important to you, then the GeForce 8800 Ultra is superior to the GeForce 8800 GTX, but only just. (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 maximum amount of data (counted in megabytes per second) that can be transported past the external memory interface in one second. It's worked out by multiplying the bus width by its memory speed. If the card has DDR memory, it should be multiplied by 2 once 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 AA, High Dynamic Range and high resolutions.
Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This figure is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The better the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.
Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as 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, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.