Radeon HD 4890 1GB vs Radeon RX 460

Intro

Compare all of that to the Radeon RX 460, which makes use of a 14 nm design. AMD has set the core frequency at 1090 MHz. The GDDR5 RAM runs at a speed of 1750 MHz on this model. It features 896 SPUs as well as 56 TAUs 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

The Radeon HD 4890 1GB, in theory, should be just a bit faster than the Radeon RX 460 overall. (explain)

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

Texel Rate

The Radeon RX 460 is quite a bit (about 53%) more effective at 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 using lots of anti-aliasing is important to you, then the Radeon RX 460 is superior to the Radeon HD 4890 1GB, 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: Memory bandwidth is the largest amount of information (counted in MB per second) that can be transported over the external memory interface in one second. It's worked out by multiplying the interface width by the speed of its memory. If it uses DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. 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 number of texture map elements (texels) that are applied in one second. This number is calculated by multiplying the total amount of texture units by the core speed of the chip. The higher the texel rate, the better the 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 most pixels the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.