Compare any two graphics cards:
Radeon R9 390 8G vs Radeon RX 5700 XT
IntroThe Radeon R9 390 8G comes with a GPU core speed of 1000 MHz, and the 8192 MB of GDDR5 RAM runs at 1500 MHz through a 512-bit bus. It also is made up of 2560 Stream Processors, 160 TAUs, and 64 ROPs.
Compare all that to the Radeon RX 5700 XT, which has core speeds of 1605 MHz on the GPU, and 14000 MHz on the 8096 MB of GDDR6 RAM. It features 2560 SPUs along with 160 Texture Address Units and 64 ROPs.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
As far as performance goes, the Radeon RX 5700 XT should theoretically be a little bit superior to the Radeon R9 390 8G in general. (explain)
Texel RateThe Radeon RX 5700 XT will be much (approximately 61%) more effective at texture filtering than the Radeon R9 390 8G. (explain)
Pixel RateIf using a high screen resolution is important to you, then the Radeon RX 5700 XT is the winner, by a large margin. (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.
Memory Bandwidth: Memory bandwidth is the largest amount of information (in units of megabytes per second) that can be moved over the external memory interface in one second. The number is worked out by multiplying the bus width by its memory speed. If the card has DDR memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.
Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This figure is worked out by multiplying the total texture units of the card by the core speed of the chip. The higher the texel rate, the better the 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 its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.