Compare any two graphics cards:
GeForce GTX 1080 vs Radeon R9 390X 8G
IntroThe GeForce GTX 1080 makes use of a 16 nm design. nVidia has set the core speed at 1607 MHz. The GDDR5X RAM works at a frequency of 1251 MHz on this specific model. It features 2560 SPUs along with 160 TAUs and 64 Rasterization Operator Units.
Compare all that to the Radeon R9 390X 8G, which has a core clock frequency of 1050 MHz and a GDDR5 memory frequency of 1500 MHz. It also makes use of a 512-bit memory bus, and makes use of a 28 nm design. It is comprised of 2816 SPUs, 176 TAUs, and 64 Raster Operation Units.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
As far as performance goes, the Radeon R9 390X 8G should theoretically be a bit superior to the GeForce GTX 1080 overall. (explain)
Texel RateThe GeForce GTX 1080 should be much (approximately 39%) faster with regards to texture filtering than the Radeon R9 390X 8G. (explain)
Pixel RateThe GeForce GTX 1080 will be much (about 53%) more effective at AA than the Radeon R9 390X 8G, and will be capable of handling higher resolutions better. (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 data (measured in megabytes per second) that can be transported past the external memory interface in one second. It is calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.
Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This is worked out by multiplying the total texture units by the core clock speed of the chip. The better the texel rate, the better the 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 the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to 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 bandwidth is, the lower the ability to reach the maximum fill rate.