Radeon HD 6870 vs Radeon RX 470 4GB

Intro

Compare that to the Radeon RX 470 4GB, which makes use of a 14 nm design. AMD has set the core frequency at 926 MHz. The GDDR5 memory works at a speed of 1650 MHz on this particular model. It features 2048 SPUs along with 128 Texture Address Units 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 6870		151 Watts
	Difference: 31 Watts (26%)

Memory Bandwidth

The Radeon RX 470 4GB should in theory be quite a bit faster than the Radeon HD 6870 in general. (explain)

Radeon RX 470 4GB		211200 MB/sec
Radeon HD 6870		134400 MB/sec
	Difference: 76800 (57%)

Texel Rate

The Radeon RX 470 4GB is much (more or less 135%) faster with regards to texture filtering than the Radeon HD 6870. (explain)

Radeon RX 470 4GB		118528 Mtexels/sec
Radeon HD 6870		50400 Mtexels/sec
	Difference: 68128 (135%)

Pixel Rate

The Radeon RX 470 4GB will be a bit (about 3%) better at AA than the Radeon HD 6870, and capable of handling higher resolutions without slowing down too much. (explain)

Radeon RX 470 4GB		29632 Mpixels/sec
Radeon HD 6870		28800 Mpixels/sec
	Difference: 832 (3%)

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 (measured in megabytes per second) that can be transferred over the external memory interface within a second. It's worked out by multiplying the bus width by its memory clock speed. If the card has DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better 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 can be processed per second. This is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The better the texel rate, the better the card will be at 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 the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.