Radeon HD 6790 vs Radeon RX 470 4GB

Intro

Compare those specs to the Radeon RX 470 4GB, which has a clock speed of 926 MHz and a GDDR5 memory frequency of 1650 MHz. It also uses a 256-bit memory bus, and makes use of a 14 nm design. It is made up of 2048 SPUs, 128 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 470 4GB		120 Watts
Radeon HD 6790		150 Watts
	Difference: 30 Watts (25%)

Memory Bandwidth

In theory, the Radeon RX 470 4GB will be 57% faster than the Radeon HD 6790 in general, because of its greater data rate. (explain)

Radeon RX 470 4GB		211200 MB/sec
Radeon HD 6790		134400 MB/sec
	Difference: 76800 (57%)

Texel Rate

The Radeon RX 470 4GB will be quite a bit (more or less 253%) faster with regards to texture filtering than the Radeon HD 6790. (explain)

Radeon RX 470 4GB		118528 Mtexels/sec
Radeon HD 6790		33600 Mtexels/sec
	Difference: 84928 (253%)

Pixel Rate

The Radeon RX 470 4GB is a lot (approximately 120%) faster with regards to AA than the Radeon HD 6790, and able to handle higher screen resolutions without slowing down too much. (explain)

Radeon RX 470 4GB		29632 Mpixels/sec
Radeon HD 6790		13440 Mpixels/sec
	Difference: 16192 (120%)

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 information (in units of megabytes per second) that can be moved over the external memory interface in one second. The number is calculated by multiplying the card's bus width by the speed of its memory. In the case of DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 amount of texture map elements (texels) that can be processed in one second. This figure is worked out by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the the core 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 output rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.