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Radeon HD 6850 vs Radeon R9 M390X

Intro

The Radeon HD 6850 features a GPU core speed of 775 MHz, and the 1024 MB of GDDR5 memory is set to run at 1000 MHz through a 256-bit bus. It also features 960 SPUs, 48 Texture Address Units, and 32 ROPs.

Compare all of that to the Radeon R9 M390X, which has GPU clock speed of 723 MHz, and 4096 MB of GDDR5 RAM set to run at 1250 MHz through a 256-bit bus. It also features 2048 Stream Processors, 128 TAUs, 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

In theory, the Radeon R9 M390X will be 25% quicker than the Radeon HD 6850 in general, because of its higher data rate. (explain)

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

Texel Rate

The Radeon R9 M390X is much (more or less 149%) faster with regards to texture 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 high levels of AA is important to you, then the Radeon HD 6850 is a better choice, but it probably won't make a huge difference. (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: Bandwidth is the largest amount of data (counted in MB per second) that can be transported across the external memory interface in a second. It's calculated by multiplying the card's bus width by its memory clock speed. If it uses DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This number is worked out by multiplying the total 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 handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as 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 - the lower the memory bandwidth is, the lower the ability to reach the max 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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