Compare any two graphics cards:
Nvidia Titan X vs Radeon R9 390 8G
IntroThe Nvidia Titan X comes with a GPU clock speed of 1417 MHz, and the 12288 MB of GDDR5X memory is set to run at 1251 MHz through a 384-bit bus. It also is made up of 3584 SPUs, 224 Texture Address Units, and 96 Raster Operation Units.
Compare all of that to the Radeon R9 390 8G, which comes with GPU clock speed of 1000 MHz, and 8192 MB of GDDR5 memory set to run at 1500 MHz through a 512-bit bus. It also features 2560 Stream Processors, 160 TAUs, and 64 ROPs.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
The Nvidia Titan X, in theory, should perform quite a bit faster than the Radeon R9 390 8G overall. (explain)
Texel RateThe Nvidia Titan X should be quite a bit (approximately 98%) faster with regards to texture filtering than the Radeon R9 390 8G. (explain)
Pixel RateThe Nvidia Titan X should be a lot (approximately 113%) more effective at anti-aliasing than the Radeon R9 390 8G, and also will be able to handle higher screen resolutions without losing too much performance. (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 largest amount of information (in units of megabytes per second) that can be moved past the external memory interface in a second. It is worked out by multiplying the interface width by its memory speed. In the case of DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, 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 of the card by the core 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 per second.
Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly write to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output 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 potential to reach the maximum fill rate.