Radeon HD 6870 vs Radeon RX 560

Intro

Compare all of that to the Radeon RX 560, which comes with core clock speeds of 1175 MHz on the GPU, and 1750 MHz on the 4096 MB of GDDR5 memory. It features 1024 SPUs along with 64 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 560		80 Watts
Radeon HD 6870		151 Watts
	Difference: 71 Watts (89%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6870 is 17% faster than the Radeon RX 560 overall, due to its greater data rate. (explain)

Radeon HD 6870		134400 MB/sec
Radeon RX 560		114688 MB/sec
	Difference: 19712 (17%)

Texel Rate

The Radeon RX 560 will be much (more or less 49%) more effective at anisotropic filtering than the Radeon HD 6870. (explain)

Radeon RX 560		75200 Mtexels/sec
Radeon HD 6870		50400 Mtexels/sec
	Difference: 24800 (49%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 6870 is superior to the Radeon RX 560, by a large margin. (explain)

Radeon HD 6870		28800 Mpixels/sec
Radeon RX 560		18800 Mpixels/sec
	Difference: 10000 (53%)

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.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the max amount of information (measured in megabytes per second) that can be transferred over the external memory interface in one second. The number is calculated by multiplying the card's bus width by its memory speed. If the card has DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the 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 number of texture map elements (texels) that are applied in one second. This figure is worked out by multiplying the total amount 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 texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel 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 potential to reach the max fill rate.