Radeon HD 4890 1GB vs Radeon RX 560

Intro

Compare those specifications to the Radeon RX 560, which has a core clock frequency of 1175 MHz and a GDDR5 memory speed of 1750 MHz. It also features a 128-bit memory bus, and makes use of a 14 nm design. It is made up of 1024 SPUs, 64 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 560		80 Watts
Radeon HD 4890 1GB		190 Watts
	Difference: 110 Watts (138%)

Memory Bandwidth

In theory, the Radeon HD 4890 1GB should be 9% faster than the Radeon RX 560 overall, due to its greater bandwidth. (explain)

Radeon HD 4890 1GB		124800 MB/sec
Radeon RX 560		114688 MB/sec
	Difference: 10112 (9%)

Texel Rate

The Radeon RX 560 is quite a bit (approximately 88%) faster with regards to AF than the Radeon HD 4890 1GB. (explain)

Radeon RX 560		75200 Mtexels/sec
Radeon HD 4890 1GB		40000 Mtexels/sec
	Difference: 35200 (88%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon RX 560 is a better choice, though only just barely. (explain)

Radeon RX 560		18800 Mpixels/sec
Radeon HD 4890 1GB		16000 Mpixels/sec
	Difference: 2800 (18%)

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 max amount of information (measured in MB per second) that can be transported over the external memory interface in one second. The number is worked out by multiplying the card's interface width by its memory speed. If it uses DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, 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 number of texture units by the core clock speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on 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 memory bandwidth is, the lower the potential to get to the maximum fill rate.