Radeon HD 4870 X2 vs Radeon RX 550

Intro

Compare that to the Radeon RX 550, which makes use of a 14 nm design. AMD has clocked the core speed at 1100 MHz. The GDDR5 RAM works at a speed of 1750 MHz on this particular model. It features 512 SPUs as well as 32 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 550		50 Watts
Radeon HD 4870 X2		350 Watts
	Difference: 300 Watts (600%)

Memory Bandwidth

In theory, the Radeon HD 4870 X2 is 101% faster than the Radeon RX 550 in general, due to its greater bandwidth. (explain)

Radeon HD 4870 X2		230400 MB/sec
Radeon RX 550		114688 MB/sec
	Difference: 115712 (101%)

Texel Rate

The Radeon HD 4870 X2 is much (more or less 70%) more effective at texture filtering than the Radeon RX 550. (explain)

Radeon HD 4870 X2		60000 Mtexels/sec
Radeon RX 550		35200 Mtexels/sec
	Difference: 24800 (70%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 4870 X2 is superior to the Radeon RX 550, and very much so. (explain)

Radeon HD 4870 X2		24000 Mpixels/sec
Radeon RX 550		17600 Mpixels/sec
	Difference: 6400 (36%)

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 data (measured in megabytes per second) that can be transported past the external memory interface in a second. It's worked out by multiplying the interface width by its memory clock speed. If it uses DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.