Radeon HD 6790 vs Radeon RX 560

Intro

Compare those specs to the Radeon RX 560, which features clock speeds of 1175 MHz on the GPU, and 1750 MHz on the 4096 MB of GDDR5 RAM. It features 1024 SPUs as well as 64 TAUs 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 6790		150 Watts
	Difference: 70 Watts (88%)

Memory Bandwidth

In theory, the Radeon HD 6790 should be 17% quicker than the Radeon RX 560 in general, due to its greater bandwidth. (explain)

Radeon HD 6790		134400 MB/sec
Radeon RX 560		114688 MB/sec
	Difference: 19712 (17%)

Texel Rate

The Radeon RX 560 is much (about 124%) faster with regards to anisotropic filtering than the Radeon HD 6790. (explain)

Radeon RX 560		75200 Mtexels/sec
Radeon HD 6790		33600 Mtexels/sec
	Difference: 41600 (124%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon RX 560 is superior to the Radeon HD 6790, and very much so. (explain)

Radeon RX 560		18800 Mpixels/sec
Radeon HD 6790		13440 Mpixels/sec
	Difference: 5360 (40%)

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 largest amount of data (in units of MB per second) that can be transferred across the external memory interface in a second. It is worked out by multiplying the card's interface width by its memory clock speed. If it uses DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better 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 processed per second. This is worked out by multiplying the total 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 in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.