GeForce GTX 870M vs Radeon RX 560

Intro

Compare those specifications to the Radeon RX 560, which comes with a GPU core clock speed of 1175 MHz, and 4096 MB of GDDR5 RAM set to run at 1750 MHz through a 128-bit bus. It also is made up of 1024 SPUs, 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
GeForce GTX 870M		110 Watts
	Difference: 30 Watts (38%)

Memory Bandwidth

Theoretically speaking, the Radeon RX 560 is 19% faster than the GeForce GTX 870M in general, because of its higher bandwidth. (explain)

Radeon RX 560		114688 MB/sec
GeForce GTX 870M		96000 MB/sec
	Difference: 18688 (19%)

Texel Rate

The GeForce GTX 870M should be quite a bit (approximately 40%) better at texture filtering than the Radeon RX 560. (explain)

GeForce GTX 870M		105392 Mtexels/sec
Radeon RX 560		75200 Mtexels/sec
	Difference: 30192 (40%)

Pixel Rate

The GeForce GTX 870M will be a small bit (about 20%) faster with regards to full screen anti-aliasing than the Radeon RX 560, and should be capable of handling higher screen resolutions without slowing down too much. (explain)

GeForce GTX 870M		22584 Mpixels/sec
Radeon RX 560		18800 Mpixels/sec
	Difference: 3784 (20%)

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 maximum amount of data (in units of MB per second) that can be transferred over the external memory interface in one second. The number is worked out by multiplying the bus width by its memory speed. If it uses DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This is worked out by multiplying the total number of texture units by the core clock speed of the chip. The higher this number, 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 the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.