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Radeon HD 6870 vs Radeon HD 7850


The Radeon HD 6870 comes with clock speeds of 900 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 RAM. It features 1120 SPUs as well as 56 Texture Address Units and 32 ROPs.

Compare all of that to the Radeon HD 7850, which has core clock speeds of 860 MHz on the GPU, and 1200 MHz on the 2048 MB of GDDR5 memory. It features 1024 SPUs as well as 64 TAUs and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7850 130 Watts
Radeon HD 6870 151 Watts
Difference: 21 Watts (16%)

Memory Bandwidth

As far as performance goes, the Radeon HD 7850 should in theory be a small bit better than the Radeon HD 6870 in general. (explain)

Radeon HD 7850 153600 MB/sec
Radeon HD 6870 134400 MB/sec
Difference: 19200 (14%)

Texel Rate

The Radeon HD 7850 will be a bit (more or less 9%) better at anisotropic filtering than the Radeon HD 6870. (explain)

Radeon HD 7850 55040 Mtexels/sec
Radeon HD 6870 50400 Mtexels/sec
Difference: 4640 (9%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 6870 is superior to the Radeon HD 7850, but it probably won't make a huge difference. (explain)

Radeon HD 6870 28800 Mpixels/sec
Radeon HD 7850 27520 Mpixels/sec
Difference: 1280 (5%)

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 6870

Radeon HD 7850

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.


Display Specifications

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Model Radeon HD 6870 Radeon HD 7850
Manufacturer AMD AMD
Year October 2010 March 2012
Code Name Barts XT Pitcairn Pro
Memory 1024 MB 2048 MB
Core Speed 900 MHz 860 MHz
Memory Speed 4200 MHz 4800 MHz
Power (Max TDP) 151 watts 130 watts
Bandwidth 134400 MB/sec 153600 MB/sec
Texel Rate 50400 Mtexels/sec 55040 Mtexels/sec
Pixel Rate 28800 Mpixels/sec 27520 Mpixels/sec
Unified Shaders 1120 1024
Texture Mapping Units 56 64
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 40 nm 28 nm
Transistors 1700 million 2800 million
Bus PCIe x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 4.1 OpenGL 4.2

Memory Bandwidth: Bandwidth is the maximum amount of information (measured in MB per second) that can be moved across the external memory interface in a second. The number is worked out by multiplying the card's bus width by the speed of its memory. If the card has DDR type RAM, it 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, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This figure is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher this number, 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 most pixels that the graphics chip can possibly write to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.


2 Responses to “Radeon HD 6870 vs Radeon HD 7850”
Neuen PC - Seite 52 - Das Forum - Das beste deutsche Diablo 3 Forum says:

[...] scheinen sich - zumindest theoretisch - nun auch nicht sooo viel zu geben/nehmen (je nachdem): Radeon HD 6870 vs Radeon HD 7850 – Performance Comparison Benchmarks @ Hardware Compare __________________ "Alle Menschen haben Recht, ZUMINDEST GLAUBEN SIE DAS!" (Albert [...]

Need help for VGA upgrade - says:

[...] budget is around 400. If not, i don't take the 7000series card and take the 6000series. Radeon HD 6870 vs Radeon HD 7850 – Performance Comparison Benchmarks @ Hardware Compare in that website, the different around less than 15%. but the price is differ 100+ So what do [...]

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