Radeon HD 4790 vs Radeon RX 460

Intro

Compare those specs to the Radeon RX 460, which has core clock speeds of 1090 MHz on the GPU, and 1750 MHz on the 4096 MB of GDDR5 RAM. It features 896 SPUs along with 56 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon RX 460 should in theory be a bit faster than the Radeon HD 4790 overall. (explain)

Radeon RX 460		112000 MB/sec
Radeon HD 4790		102400 MB/sec
	Difference: 9600 (9%)

Texel Rate

The Radeon RX 460 will be quite a bit (more or less 218%) better at anisotropic filtering than the Radeon HD 4790. (explain)

Radeon RX 460		61040 Mtexels/sec
Radeon HD 4790		19200 Mtexels/sec
	Difference: 41840 (218%)

Pixel Rate

The Radeon RX 460 is much (more or less 82%) faster with regards to AA than the Radeon HD 4790, and also able to handle higher resolutions more effectively. (explain)

Radeon RX 460		17440 Mpixels/sec
Radeon HD 4790		9600 Mpixels/sec
	Difference: 7840 (82%)

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 (measured in megabytes per second) that can be moved over the external memory interface in a second. It's worked out by multiplying the interface width by its memory clock speed. In the case of DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, 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 can be processed per second. This figure is calculated by multiplying the total texture units by the core 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 processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.