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Radeon HD 6850 vs Radeon RX 460

Intro

The Radeon HD 6850 has a GPU core speed of 775 MHz, and the 1024 MB of GDDR5 RAM runs at 1000 MHz through a 256-bit bus. It also is made up of 960 SPUs, 48 TAUs, and 32 Raster Operation Units.

Compare that to the Radeon RX 460, which has GPU core speed of 1090 MHz, and 4096 MB of GDDR5 memory set to run at 1750 MHz through a 128-bit bus. It also is made up of 896 Stream Processors, 56 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 460 75 Watts
Radeon HD 6850 127 Watts
Difference: 52 Watts (69%)

Memory Bandwidth

In theory, the Radeon HD 6850 will be 14% faster than the Radeon RX 460 in general, because of its higher data rate. (explain)

Radeon HD 6850 128000 MB/sec
Radeon RX 460 112000 MB/sec
Difference: 16000 (14%)

Texel Rate

The Radeon RX 460 should be a lot (more or less 64%) better at texture filtering than the Radeon HD 6850. (explain)

Radeon RX 460 61040 Mtexels/sec
Radeon HD 6850 37200 Mtexels/sec
Difference: 23840 (64%)

Pixel Rate

The Radeon HD 6850 is much (about 42%) more effective at anti-aliasing than the Radeon RX 460, and also capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon HD 6850 24800 Mpixels/sec
Radeon RX 460 17440 Mpixels/sec
Difference: 7360 (42%)

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 6850

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 6850 Radeon RX 460
Manufacturer AMD AMD
Year October 2010 August 2016
Code Name Barts Pro Polaris 11
Memory 1024 MB 4096 MB
Core Speed 775 MHz 1090 MHz
Memory Speed 4000 MHz 7000 MHz
Power (Max TDP) 127 watts 75 watts
Bandwidth 128000 MB/sec 112000 MB/sec
Texel Rate 37200 Mtexels/sec 61040 Mtexels/sec
Pixel Rate 24800 Mpixels/sec 17440 Mpixels/sec
Unified Shaders 960 896
Texture Mapping Units 48 56
Render Output Units 32 16
Bus Type GDDR5 GDDR5
Bus Width 256-bit 128-bit
Fab Process 40 nm 14 nm
Transistors 1700 million 3000 million
Bus PCIe 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 maximum amount of data (in units of megabytes per second) that can be moved across the external memory interface in one second. It's worked out by multiplying the bus width by the speed of its memory. In the case of DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This is worked out by multiplying the total texture units of the card by the core speed of the chip. The better the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines by the the core 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 rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.

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