Radeon HD 4890 2GB vs Radeon RX 550

Intro

Compare all that to the Radeon RX 550, which has a core clock speed of 1100 MHz and a GDDR5 memory speed of 1750 MHz. It also uses a 128-bit bus, and makes use of a 14 nm design. It is comprised 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 4890 2GB		190 Watts
	Difference: 140 Watts (280%)

Memory Bandwidth

Performance-wise, the Radeon HD 4890 2GB should theoretically be a small bit superior to the Radeon RX 550 in general. (explain)

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

Texel Rate

The Radeon HD 4890 2GB should be a little bit (more or less 14%) faster with regards to texture 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: Bandwidth is the largest amount of data (counted in megabytes per second) that can be transported over the external memory interface in a second. It's worked out by multiplying the bus width by its memory speed. If it uses DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, 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 texture map elements (texels) that are processed per second. This number is calculated by multiplying the total number of texture units by the core speed of the chip. The better this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.