Radeon HD 4890 2GB vs Radeon RX 460 2GB

Intro

Compare all of that to the Radeon RX 460 2GB, which makes use of a 14 nm design. AMD has set the core frequency at 1090 MHz. The GDDR5 RAM runs at a frequency of 1750 MHz on this particular model. It features 896 SPUs along with 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

The Radeon HD 4890 2GB should theoretically be just a bit faster than the Radeon RX 460 2GB in general. (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 is quite a bit (about 53%) more effective at 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

If using a high screen resolution is important to you, then the Radeon RX 460 2GB is the winner, not by a very large margin though. (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 (counted in megabytes per second) that can be moved over the external memory interface in a second. It is calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better 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 processed in one second. This figure is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The better this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.