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Radeon HD 4790 vs Radeon RX 460


Intro

The Radeon HD 4790 comes with a GPU core speed of 600 MHz, and the 512 MB of GDDR5 memory runs at 800 MHz through a 256-bit bus. It also is made up of 640(128x5) SPUs, 32 TAUs, and 16 ROPs.

Compare that to the Radeon RX 460, which makes use of a 14 nm design. AMD has clocked the core speed at 1090 MHz. The GDDR5 RAM works at a speed of 1750 MHz on this specific model. It features 896 SPUs as well as 56 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon RX 460 will be 9% quicker than the Radeon HD 4790 in general, because of its higher bandwidth. (explain)

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

Texel Rate

The Radeon RX 460 should be a lot (more or less 218%) faster with regards to 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

If using a high resolution is important to you, then the Radeon RX 460 is the winner, and very much so. (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

Radeon HD 4790

Radeon RX 460

Specifications

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Model Radeon HD 4790 Radeon RX 460
Manufacturer AMD AMD
Year 2009 August 2016
Code Name RV790 Polaris 11
Memory 512 MB 4096 MB
Core Speed 600 MHz 1090 MHz
Memory Speed 3200 MHz 7000 MHz
Power (Max TDP) (Unknown) watts 75 watts
Bandwidth 102400 MB/sec 112000 MB/sec
Texel Rate 19200 Mtexels/sec 61040 Mtexels/sec
Pixel Rate 9600 Mpixels/sec 17440 Mpixels/sec
Unified Shaders 640(128x5) 896
Texture Mapping Units 32 56
Render Output Units 16 16
Bus Type GDDR5 GDDR5
Bus Width 256-bit 128-bit
Fab Process 55 nm 14 nm
Transistors 959 million 3000 million
Bus PCIe 2.0 x16 PCIe 3.0 x16
DirectX Version DirectX 10.1 DirectX 12.0
OpenGL Version OpenGL 3.0 OpenGL 4.5

Memory Bandwidth: Bandwidth is the maximum amount of information (counted in MB per second) that can be moved over the external memory interface in a second. The number is calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This figure is calculated by multiplying the total texture units by the core speed of the chip. The higher the texel rate, the better the video 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 that the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Radeon HD 4790

Radeon RX 460

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