Radeon HD 4870 X2 vs Radeon RX 470 4GB

Intro

Compare that to the Radeon RX 470 4GB, which features clock speeds of 926 MHz on the GPU, and 1650 MHz on the 4096 MB of GDDR5 memory. It features 2048 SPUs along with 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 4870 X2		350 Watts
	Difference: 230 Watts (192%)

Memory Bandwidth

The Radeon HD 4870 X2 should theoretically be a small bit faster than the Radeon RX 470 4GB overall. (explain)

Radeon HD 4870 X2		230400 MB/sec
Radeon RX 470 4GB		211200 MB/sec
	Difference: 19200 (9%)

Texel Rate

The Radeon RX 470 4GB should be much (more or less 98%) faster with regards to texture filtering than the Radeon HD 4870 X2. (explain)

Radeon RX 470 4GB		118528 Mtexels/sec
Radeon HD 4870 X2		60000 Mtexels/sec
	Difference: 58528 (98%)

Pixel Rate

The Radeon RX 470 4GB is a lot (about 23%) more effective at anti-aliasing than the Radeon HD 4870 X2, and also able to handle higher screen resolutions more effectively. (explain)

Radeon RX 470 4GB		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 maximum amount of information (measured in megabytes per second) that can be moved over the external memory interface within a second. It is calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This number is calculated by multiplying the total texture units by the core clock speed of the chip. The better this number, 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 number of pixels that the graphics chip could possibly write to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.