Radeon HD 6870 vs Radeon RX 560

Intro

Compare those specifications 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 ROPs.

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 should be just a bit faster than the Radeon RX 560 in general. (explain)

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

Texel Rate

The Radeon RX 560 is a lot (about 49%) faster with regards to texture filtering than the Radeon HD 6870. (explain)

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

Pixel Rate

The Radeon HD 6870 is quite a bit (approximately 53%) better at anti-aliasing than the Radeon RX 560, and should be able to handle higher resolutions more effectively. (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: Bandwidth is the max amount of data (in units of megabytes per second) that can be transferred across the external memory interface in one second. It's calculated by multiplying the interface width by its memory speed. If the card has DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, 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 processed in one second. This is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units 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 fill rate is also dependant on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.