Radeon HD 4890 1GB vs Radeon RX 550

Intro

Compare that to the Radeon RX 550, which comes with clock speeds of 1100 MHz on the GPU, and 1750 MHz on the 2048 MB of GDDR5 memory. It features 512 SPUs along with 32 Texture Address Units 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 4890 1GB		190 Watts
	Difference: 140 Watts (280%)

Memory Bandwidth

The Radeon HD 4890 1GB, in theory, should be a bit faster than the Radeon RX 550 in general. (explain)

Radeon HD 4890 1GB		124800 MB/sec
Radeon RX 550		114688 MB/sec
	Difference: 10112 (9%)

Texel Rate

The Radeon HD 4890 1GB is a bit (approximately 14%) more effective at anisotropic filtering than the Radeon RX 550. (explain)

Radeon HD 4890 1GB		40000 Mtexels/sec
Radeon RX 550		35200 Mtexels/sec
	Difference: 4800 (14%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon RX 550 is the winner, but not by far. (explain)

Radeon RX 550		17600 Mpixels/sec
Radeon HD 4890 1GB		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 largest amount of information (counted in MB per second) that can be transferred past the external memory interface within a second. It is worked out by multiplying the card's interface width by its memory speed. In the case of DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better 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 are processed in one second. This figure is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The better the texel rate, the better the graphics 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 most pixels the video card can possibly record to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.