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Radeon HD 7790 vs Radeon RX 460

Intro

The Radeon HD 7790 comes with clock speeds of 1000 MHz on the GPU, and 1500 MHz on the 1024 MB of GDDR5 RAM. It features 896 SPUs along with 56 Texture Address Units and 16 Rasterization Operator Units.

Compare all that to the Radeon RX 460, which has a clock speed of 1090 MHz and a GDDR5 memory speed of 1750 MHz. It also uses a 128-bit memory bus, and makes use of a 14 nm design. It is comprised of 896 SPUs, 56 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 460 75 Watts
Radeon HD 7790 85 Watts
Difference: 10 Watts (13%)

Memory Bandwidth

As far as performance goes, the Radeon RX 460 should theoretically be a bit superior to the Radeon HD 7790 overall. (explain)

Radeon RX 460 112000 MB/sec
Radeon HD 7790 96000 MB/sec
Difference: 16000 (17%)

Texel Rate

The Radeon RX 460 will be a bit (more or less 9%) more effective at anisotropic filtering than the Radeon HD 7790. (explain)

Radeon RX 460 61040 Mtexels/sec
Radeon HD 7790 56000 Mtexels/sec
Difference: 5040 (9%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon RX 460 is a better choice, not by a very large margin though. (explain)

Radeon RX 460 17440 Mpixels/sec
Radeon HD 7790 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

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Radeon HD 7790

Amazon.com

Radeon RX 460

Amazon.com

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 7790 Radeon RX 460
Manufacturer AMD AMD
Year March 2013 August 2016
Code Name Bonaire XT Polaris 11
Memory 1024 MB 4096 MB
Core Speed 1000 MHz 1090 MHz
Memory Speed 6000 MHz 7000 MHz
Power (Max TDP) 85 watts 75 watts
Bandwidth 96000 MB/sec 112000 MB/sec
Texel Rate 56000 Mtexels/sec 61040 Mtexels/sec
Pixel Rate 16000 Mpixels/sec 17440 Mpixels/sec
Unified Shaders 896 896
Texture Mapping Units 56 56
Render Output Units 16 16
Bus Type GDDR5 GDDR5
Bus Width 128-bit 128-bit
Fab Process 28 nm 14 nm
Transistors 2080 million 3000 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.1 DirectX 12.0
OpenGL Version OpenGL 4.3 OpenGL 4.5

Memory Bandwidth: Memory bandwidth is the max amount of data (in units of megabytes per second) that can be transferred over the external memory interface in a second. It's worked out by multiplying the interface width by the speed of its memory. In the case of DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher 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 number of texture map elements (texels) that can be applied per second. This figure is worked out by multiplying the total number of texture units by the core clock speed of the chip. The better 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 one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly record to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

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