Compare any two graphics cards:
GeForce 9800 GTX+ vs GeForce 9800 GX2
IntroThe GeForce 9800 GTX+ features a clock speed of 738 MHz and a GDDR3 memory frequency of 1100 MHz. It also makes use of a 256-bit bus, and makes use of a 55 nm design. It is comprised of 128 SPUs, 64 Texture Address Units, and 16 ROPs.
Compare that to the GeForce 9800 GX2, which features a GPU core clock speed of 600 MHz, and 512 MB of GDDR3 RAM running at 1000 MHz through a 256-bit bus. It also features 128 SPUs, 64 Texture Address Units, and 16 Raster Operation Units.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
Theoretically speaking, the GeForce 9800 GX2 should be much faster than the GeForce 9800 GTX+ in general. (explain)
Texel RateThe GeForce 9800 GX2 is quite a bit (approximately 63%) more effective at texture filtering than the GeForce 9800 GTX+. (explain)
Pixel RateThe GeForce 9800 GX2 should be a lot (approximately 63%) more effective at anti-aliasing than the GeForce 9800 GTX+, and will be capable of handling higher 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.
One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.
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 largest amount of data (measured in MB per second) that can be transported across the external memory interface in a second. It is worked out by multiplying the interface width by the speed of its memory. In the case of DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.
Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one second. This figure is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher 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 one second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.