Radeon HD 4890 1GB vs Radeon RX 460 2GB

Intro

Compare those specifications to the Radeon RX 460 2GB, which features a GPU core clock speed of 1090 MHz, and 2048 MB of GDDR5 memory set to run at 1750 MHz through a 128-bit bus. It also features 896 Stream Processors, 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 2GB		75 Watts
Radeon HD 4890 1GB		190 Watts
	Difference: 115 Watts (153%)

Memory Bandwidth

In theory, the Radeon HD 4890 1GB should be 11% faster than the Radeon RX 460 2GB in general, due to its greater bandwidth. (explain)

Radeon HD 4890 1GB		124800 MB/sec
Radeon RX 460 2GB		112000 MB/sec
	Difference: 12800 (11%)

Texel Rate

The Radeon RX 460 2GB will be much (about 53%) better at anisotropic filtering than the Radeon HD 4890 1GB. (explain)

Radeon RX 460 2GB		61040 Mtexels/sec
Radeon HD 4890 1GB		40000 Mtexels/sec
	Difference: 21040 (53%)

Pixel Rate

The Radeon RX 460 2GB is just a bit (more or less 9%) faster with regards to AA than the Radeon HD 4890 1GB, and also capable of handling higher resolutions while still performing well. (explain)

Radeon RX 460 2GB		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: Memory bandwidth is the maximum amount of data (in units of MB per second) that can be moved across the external memory interface within a second. The number is worked out by multiplying the card's bus width by its memory speed. In the case of DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This number is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The higher this number, the better the 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 maximum number of pixels that the graphics chip could possibly record to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the the core 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 fill rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.