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Radeon HD 6790 vs Radeon RX 460 2GB

Intro

The Radeon HD 6790 features a GPU core clock speed of 840 MHz, and the 1024 MB of GDDR5 RAM runs at 1050 MHz through a 256-bit bus. It also is made up of 800 SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Compare those specifications to the Radeon RX 460 2GB, which uses a 14 nm design. AMD has clocked the core speed at 1090 MHz. The GDDR5 RAM works at a frequency of 1750 MHz on this particular card. It features 896 SPUs along with 56 Texture Address Units and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 460 2GB 75 Watts
Radeon HD 6790 150 Watts
Difference: 75 Watts (100%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6790 is 20% faster than the Radeon RX 460 2GB overall, because of its higher data rate. (explain)

Radeon HD 6790 134400 MB/sec
Radeon RX 460 2GB 112000 MB/sec
Difference: 22400 (20%)

Texel Rate

The Radeon RX 460 2GB should be a lot (approximately 82%) more effective at AF than the Radeon HD 6790. (explain)

Radeon RX 460 2GB 61040 Mtexels/sec
Radeon HD 6790 33600 Mtexels/sec
Difference: 27440 (82%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon RX 460 2GB is superior to the Radeon HD 6790, and very much so. (explain)

Radeon RX 460 2GB 17440 Mpixels/sec
Radeon HD 6790 13440 Mpixels/sec
Difference: 4000 (30%)

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

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Radeon HD 6790

Amazon.com

Check prices at:

Radeon RX 460 2GB

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model Radeon HD 6790 Radeon RX 460 2GB
Manufacturer AMD AMD
Year April 2011 August 2016
Code Name Barts LE Polaris 11
Memory 1024 MB 2048 MB
Core Speed 840 MHz 1090 MHz
Memory Speed 4200 MHz 7000 MHz
Power (Max TDP) 150 watts 75 watts
Bandwidth 134400 MB/sec 112000 MB/sec
Texel Rate 33600 Mtexels/sec 61040 Mtexels/sec
Pixel Rate 13440 Mpixels/sec 17440 Mpixels/sec
Unified Shaders 800 896
Texture Mapping Units 40 56
Render Output Units 16 16
Bus Type GDDR5 GDDR5
Bus Width 256-bit 128-bit
Fab Process 40 nm 14 nm
Transistors 1700 million 3000 million
Bus PCIe 2.1 x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 12.0
OpenGL Version OpenGL 4.1 OpenGL 4.5

Memory Bandwidth: Bandwidth is the max amount of data (counted in MB per second) that can be moved across the external memory interface within a second. It's calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better 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 amount of texture map elements (texels) that are applied in one second. This is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

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Radeon HD 6790

Amazon.com

Check prices at:

Radeon RX 460 2GB

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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