Radeon HD 4870 X2 vs Radeon RX 580

Intro

Compare those specifications to the Radeon RX 580, which has a GPU core clock speed of 1257 MHz, and 8192 MB of GDDR5 RAM set to run at 2000 MHz through a 256-bit bus. It also features 2304 SPUs, 144 TAUs, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 580		185 Watts
Radeon HD 4870 X2		350 Watts
	Difference: 165 Watts (89%)

Memory Bandwidth

As far as performance goes, the Radeon RX 580 should in theory be a bit superior to the Radeon HD 4870 X2 in general. (explain)

Radeon RX 580		262144 MB/sec
Radeon HD 4870 X2		230400 MB/sec
	Difference: 31744 (14%)

Texel Rate

The Radeon RX 580 should be much (approximately 202%) faster with regards to anisotropic filtering than the Radeon HD 4870 X2. (explain)

Radeon RX 580		181008 Mtexels/sec
Radeon HD 4870 X2		60000 Mtexels/sec
	Difference: 121008 (202%)

Pixel Rate

The Radeon RX 580 should be quite a bit (approximately 68%) more effective at FSAA than the Radeon HD 4870 X2, and should be capable of handling higher screen resolutions better. (explain)

Radeon RX 580		40224 Mpixels/sec
Radeon HD 4870 X2		24000 Mpixels/sec
	Difference: 16224 (68%)

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 largest amount of information (in units of MB per second) that can be transferred across the external memory interface in one second. The number is calculated by multiplying the card's bus width by its memory clock speed. If it uses DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines by the the card's 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 ability to get to the max fill rate.