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Radeon HD 6850 vs Radeon R9 M390X

Intro

The Radeon HD 6850 makes use of a 40 nm design. AMD has clocked the core speed at 775 MHz. The GDDR5 memory runs at a frequency of 1000 MHz on this specific model. It features 960 SPUs as well as 48 TAUs and 32 ROPs.

Compare that to the Radeon R9 M390X, which comes with GPU core speed of 723 MHz, and 4096 MB of GDDR5 memory set to run at 1250 MHz through a 256-bit bus. It also is comprised of 2048 Stream Processors, 128 Texture Address Units, and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M390X 125 Watts
Radeon HD 6850 127 Watts
Difference: 2 Watts (2%)

Memory Bandwidth

The Radeon R9 M390X should in theory be a lot faster than the Radeon HD 6850 in general. (explain)

Radeon R9 M390X 160000 MB/sec
Radeon HD 6850 128000 MB/sec
Difference: 32000 (25%)

Texel Rate

The Radeon R9 M390X is much (about 149%) better at anisotropic filtering than the Radeon HD 6850. (explain)

Radeon R9 M390X 92544 Mtexels/sec
Radeon HD 6850 37200 Mtexels/sec
Difference: 55344 (149%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 6850 is a better choice, but not by far. (explain)

Radeon HD 6850 24800 Mpixels/sec
Radeon R9 M390X 23136 Mpixels/sec
Difference: 1664 (7%)

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

Check prices at:

Radeon R9 M390X

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 6850 Radeon R9 M390X
Manufacturer AMD AMD
Year October 2010 2015
Code Name Barts Pro Tonga
Memory 1024 MB 4096 MB
Core Speed 775 MHz 723 MHz
Memory Speed 4000 MHz 5000 MHz
Power (Max TDP) 127 watts 125 watts
Bandwidth 128000 MB/sec 160000 MB/sec
Texel Rate 37200 Mtexels/sec 92544 Mtexels/sec
Pixel Rate 24800 Mpixels/sec 23136 Mpixels/sec
Unified Shaders 960 2048
Texture Mapping Units 48 128
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 40 nm 28 nm
Transistors 1700 million (Unknown) million
Bus PCIe x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 12
OpenGL Version OpenGL 4.1 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the largest amount of data (counted in MB per second) that can be moved across the external memory interface within a second. It is worked out by multiplying the card's interface width by its memory speed. In the case of DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This figure is calculated by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount 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 also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 6850

Amazon.com

Check prices at:

Radeon R9 M390X

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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