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Radeon HD 4790 vs Radeon RX 460


Intro

The Radeon HD 4790 has a GPU core speed of 600 MHz, and the 512 MB of GDDR5 RAM is set to run at 800 MHz through a 256-bit bus. It also is comprised of 640(128x5) Stream Processors, 32 TAUs, and 16 ROPs.

Compare those specifications to the Radeon RX 460, which uses a 14 nm design. AMD has clocked the core frequency at 1090 MHz. The GDDR5 RAM runs at a speed of 1750 MHz on this particular card. It features 896 SPUs along with 56 TAUs and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon RX 460 should in theory be a small bit faster than the Radeon HD 4790 in general. (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 (approximately 218%) more effective 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

If running with high levels of AA is important to you, then the Radeon RX 460 is superior to the Radeon HD 4790, by far. (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

Display 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: Memory bandwidth is the maximum amount of data (measured in MB per second) that can be transferred across the external memory interface within a second. The number is worked out by multiplying the card's bus width by the speed of its memory. If it uses DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This figure is calculated by multiplying the total number of texture units of the card by the core clock 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 per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.

Radeon HD 4790

Radeon RX 460

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