Radeon HD 4890 2GB vs Radeon RX 460 2GB

Intro

Compare those specifications to the Radeon RX 460 2GB, which comes with GPU core speed of 1090 MHz, and 2048 MB of GDDR5 memory set to run at 1750 MHz through a 128-bit bus. It also is comprised of 896 Stream Processors, 56 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 460 2GB		75 Watts
Radeon HD 4890 2GB		190 Watts
	Difference: 115 Watts (153%)

Memory Bandwidth

Performance-wise, the Radeon HD 4890 2GB should in theory be a bit better than the Radeon RX 460 2GB overall. (explain)

Radeon HD 4890 2GB		124800 MB/sec
Radeon RX 460 2GB		112000 MB/sec
	Difference: 12800 (11%)

Texel Rate

The Radeon RX 460 2GB should be a lot (more or less 53%) faster with regards to anisotropic filtering than the Radeon HD 4890 2GB. (explain)

Radeon RX 460 2GB		61040 Mtexels/sec
Radeon HD 4890 2GB		40000 Mtexels/sec
	Difference: 21040 (53%)

Pixel Rate

The Radeon RX 460 2GB is just a bit (approximately 9%) faster with regards to AA than the Radeon HD 4890 2GB, and also should be able to handle higher screen resolutions without slowing down too much. (explain)

Radeon RX 460 2GB		17440 Mpixels/sec
Radeon HD 4890 2GB		16000 Mpixels/sec
	Difference: 1440 (9%)

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 (in units of MB per second) that can be transported across the external memory interface within a second. The number is calculated by multiplying the bus width by the speed of its memory. If it uses DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied per second. This is calculated by multiplying the total number of texture units of the card 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 a second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units 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 rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.