Radeon HD 7870 XT vs Radeon RX 560

Intro

Compare that to the Radeon RX 560, which features core clock speeds of 1175 MHz on the GPU, and 1750 MHz on the 4096 MB of GDDR5 RAM. It features 1024 SPUs along with 64 TAUs 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 7870 XT		185 Watts
	Difference: 105 Watts (131%)

Memory Bandwidth

Performance-wise, the Radeon HD 7870 XT should in theory be quite a bit better than the Radeon RX 560 in general. (explain)

Radeon HD 7870 XT		192000 MB/sec
Radeon RX 560		114688 MB/sec
	Difference: 77312 (67%)

Texel Rate

The Radeon HD 7870 XT will be just a bit (more or less 18%) faster with regards to texture filtering than the Radeon RX 560. (explain)

Radeon HD 7870 XT		88800 Mtexels/sec
Radeon RX 560		75200 Mtexels/sec
	Difference: 13600 (18%)

Pixel Rate

The Radeon HD 7870 XT should be quite a bit (about 57%) better at full screen anti-aliasing than the Radeon RX 560, and capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon HD 7870 XT		29600 Mpixels/sec
Radeon RX 560		18800 Mpixels/sec
	Difference: 10800 (57%)

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 (counted in MB per second) that can be transferred past the external memory interface within a second. The number is worked out by multiplying the bus width by the speed of its memory. If the card has DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher 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 texture map elements (texels) that are applied in one second. This number is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher this number, the better the video 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 amount of pixels that the graphics chip can possibly write to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of 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 is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.