Compare any two graphics cards:
GeForce 8800 GTX vs GeForce 8800 Ultra
IntroThe GeForce 8800 GTX features a core clock frequency of 575 MHz and a GDDR3 memory frequency of 900 MHz. It also features a 384-bit bus, and makes use of a 90 nm design. It is comprised of 128 SPUs, 64 Texture Address Units, and 24 Raster Operation Units.
Compare those specifications to the GeForce 8800 Ultra, which has a GPU core clock speed of 612 MHz, and 768 MB of GDDR3 memory set to run at 1080 MHz through a 384-bit bus. It also is made up of 128 Stream Processors, 64 TAUs, and 24 Raster Operation Units.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
Theoretically speaking, the GeForce 8800 Ultra is 20% quicker than the GeForce 8800 GTX in general, because of its greater data rate. (explain)
Texel RateThe GeForce 8800 Ultra will be just a bit (about 6%) faster with regards to anisotropic 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 not by far. (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 maximum amount of information (measured in MB per second) that can be transferred across the external memory interface in one second. It is calculated by multiplying the interface width by its memory clock speed. If it uses DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.
Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This figure is worked out by multiplying the total number of texture units by the core clock speed of the chip. The higher the texel rate, the better the video card will be at handling 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 that the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number 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 output rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.