Radeon HD 4890 1GB vs Radeon RX 460

Intro

Compare that to the Radeon RX 460, which features a clock speed of 1090 MHz and a GDDR5 memory speed of 1750 MHz. It also features a 128-bit memory bus, and uses a 14 nm design. It features 896 SPUs, 56 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 460		75 Watts
Radeon HD 4890 1GB		190 Watts
	Difference: 115 Watts (153%)

Memory Bandwidth

Theoretically, the Radeon HD 4890 1GB should be a small bit faster than the Radeon RX 460 in general. (explain)

Radeon HD 4890 1GB		124800 MB/sec
Radeon RX 460		112000 MB/sec
	Difference: 12800 (11%)

Texel Rate

The Radeon RX 460 is much (about 53%) faster with regards to anisotropic filtering than the Radeon HD 4890 1GB. (explain)

Radeon RX 460		61040 Mtexels/sec
Radeon HD 4890 1GB		40000 Mtexels/sec
	Difference: 21040 (53%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon RX 460 is the winner, but not by far. (explain)

Radeon RX 460		17440 Mpixels/sec
Radeon HD 4890 1GB		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 (counted in MB per second) that can be moved across the external memory interface in a second. It's worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the better 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 number of texture map elements (texels) that are applied in one second. This is worked out by multiplying the total number of texture units of the card by the core 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 processed in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines 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 also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.