Radeon HD 4850 X2 512MB vs Radeon RX 550

Intro

Compare all that to the Radeon RX 550, which features a clock frequency of 1100 MHz and a GDDR5 memory frequency of 1750 MHz. It also makes use of a 128-bit bus, and uses a 14 nm design. It is made up of 512 SPUs, 32 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 550		50 Watts
Radeon HD 4850 X2 512MB		250 Watts
	Difference: 200 Watts (400%)

Memory Bandwidth

As far as performance goes, the Radeon HD 4850 X2 512MB should theoretically be just a bit better than the Radeon RX 550 in general. (explain)

Radeon HD 4850 X2 512MB		127104 MB/sec
Radeon RX 550		114688 MB/sec
	Difference: 12416 (11%)

Texel Rate

The Radeon HD 4850 X2 512MB should be a lot (more or less 42%) more effective at anisotropic filtering than the Radeon RX 550. (explain)

Radeon HD 4850 X2 512MB		50000 Mtexels/sec
Radeon RX 550		35200 Mtexels/sec
	Difference: 14800 (42%)

Pixel Rate

The Radeon HD 4850 X2 512MB will be a little bit (more or less 14%) faster with regards to FSAA than the Radeon RX 550, and capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon HD 4850 X2 512MB		20000 Mpixels/sec
Radeon RX 550		17600 Mpixels/sec
	Difference: 2400 (14%)

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 max amount of information (counted in MB per second) that can be transported across the external memory interface in a second. It is calculated by multiplying the bus width by the speed of its memory. If the card has DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster 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 can be processed per second. This figure is calculated by multiplying the total number of texture units by the core clock speed of the chip. The higher this number, the better the graphics 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 maximum number of pixels that the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.