Radeon HD 4870 X2 vs Radeon RX 470

Intro

Compare all that to the Radeon RX 470, which features GPU clock speed of 926 MHz, and 8192 MB of GDDR5 memory running at 1650 MHz through a 256-bit bus. It also features 2048 Stream Processors, 128 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 470		120 Watts
Radeon HD 4870 X2		350 Watts
	Difference: 230 Watts (192%)

Memory Bandwidth

In theory, the Radeon HD 4870 X2 is 9% faster than the Radeon RX 470 in general, because of its greater bandwidth. (explain)

Radeon HD 4870 X2		230400 MB/sec
Radeon RX 470		211200 MB/sec
	Difference: 19200 (9%)

Texel Rate

The Radeon RX 470 will be quite a bit (more or less 98%) better at AF than the Radeon HD 4870 X2. (explain)

Radeon RX 470		118528 Mtexels/sec
Radeon HD 4870 X2		60000 Mtexels/sec
	Difference: 58528 (98%)

Pixel Rate

The Radeon RX 470 will be quite a bit (more or less 23%) better at FSAA than the Radeon HD 4870 X2, and also will be capable of handling higher screen resolutions better. (explain)

Radeon RX 470		29632 Mpixels/sec
Radeon HD 4870 X2		24000 Mpixels/sec
	Difference: 5632 (23%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the max amount of data (counted in MB per second) that can be transported past the external memory interface in one second. It is worked out by multiplying the card's interface width by the speed of its memory. If the card has DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher 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 applied in one second. This is worked out by multiplying the total texture units by the core speed of the chip. The higher the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.