Radeon HD 4870 X2 vs Radeon RX 470

Intro

Compare all that to the Radeon RX 470, which comes with clock speeds of 926 MHz on the GPU, and 1650 MHz on the 8192 MB of GDDR5 RAM. 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		120 Watts
Radeon HD 4870 X2		350 Watts
	Difference: 230 Watts (192%)

Memory Bandwidth

As far as performance goes, the Radeon HD 4870 X2 should theoretically be a little bit superior to the Radeon RX 470 overall. (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 a lot (approximately 98%) better at texture filtering 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 should be much (more or less 23%) better at full screen anti-aliasing than the Radeon HD 4870 X2, and also should be able to handle higher screen resolutions more effectively. (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: Bandwidth is the maximum amount of data (counted in megabytes per second) that can be moved across the external memory interface within a second. It is calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This number is worked out by multiplying the total amount of texture units by the core speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.