Radeon HD 4890 2GB vs Radeon RX 550

Intro

Compare all of that to the Radeon RX 550, which comes with GPU clock speed of 1100 MHz, and 2048 MB of GDDR5 memory set to run at 1750 MHz through a 128-bit bus. It also features 512 Stream Processors, 32 Texture Address Units, 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 4890 2GB		190 Watts
	Difference: 140 Watts (280%)

Memory Bandwidth

The Radeon HD 4890 2GB should theoretically be a little bit faster than the Radeon RX 550 overall. (explain)

Radeon HD 4890 2GB		124800 MB/sec
Radeon RX 550		114688 MB/sec
	Difference: 10112 (9%)

Texel Rate

The Radeon HD 4890 2GB is just a bit (about 14%) faster with regards to anisotropic filtering than the Radeon RX 550. (explain)

Radeon HD 4890 2GB		40000 Mtexels/sec
Radeon RX 550		35200 Mtexels/sec
	Difference: 4800 (14%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon RX 550 is the winner, not by a very large margin though. (explain)

Radeon RX 550		17600 Mpixels/sec
Radeon HD 4890 2GB		16000 Mpixels/sec
	Difference: 1600 (10%)

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.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the maximum amount of information (measured in megabytes per second) that can be moved past the external memory interface in one second. It is calculated by multiplying the bus width by its memory speed. If the card has DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, 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 is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.