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Radeon HD 6770 vs Radeon HD 6850

Intro

The Radeon HD 6770 has a GPU core speed of 900 MHz, and the 512 MB of GDDR5 memory runs at 1050 MHz through a 128-bit bus. It also is made up of 800 SPUs, 40 TAUs, and 16 ROPs.

Compare that to the Radeon HD 6850, which makes use of a 40 nm design. AMD has set the core speed at 775 MHz. The GDDR5 RAM is set to run at a speed of 1000 MHz on this specific model. It features 960 SPUs as well as 48 Texture Address Units and 32 ROPs.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770 108 Watts
Radeon HD 6850 127 Watts
Difference: 19 Watts (18%)

Memory Bandwidth

In theory, the Radeon HD 6850 should be a lot faster than the Radeon HD 6770 overall. (explain)

Radeon HD 6850 128000 MB/sec
Radeon HD 6770 67200 MB/sec
Difference: 60800 (90%)

Texel Rate

The Radeon HD 6850 is a small bit (more or less 3%) faster with regards to anisotropic filtering than the Radeon HD 6770. (explain)

Radeon HD 6850 37200 Mtexels/sec
Radeon HD 6770 36000 Mtexels/sec
Difference: 1200 (3%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 6850 is a better choice, by far. (explain)

Radeon HD 6850 24800 Mpixels/sec
Radeon HD 6770 14400 Mpixels/sec
Difference: 10400 (72%)

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

Radeon HD 6770

Amazon.com

Radeon HD 6850

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

Model Radeon HD 6770 Radeon HD 6850
Manufacturer AMD AMD
Year January 2011 October 2010
Code Name Juniper XT Barts Pro
Fab Process 40 nm 40 nm
Bus PCIe x16 PCIe x16
Memory 512 MB 1024 MB
Core Speed 900 MHz 775 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 1050 MHz (4200 MHz effective) 1000 MHz (4000 MHz effective)
Unified Shaders 800 960
Texture Mapping Units 40 48
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 128-bit 256-bit
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 4.1 OpenGL 4.1
Power (Max TDP) 108 watts 127 watts
Shader Model 5.0 5.0
Bandwidth 67200 MB/sec 128000 MB/sec
Texel Rate 36000 Mtexels/sec 37200 Mtexels/sec
Pixel Rate 14400 Mpixels/sec 24800 Mpixels/sec

Memory Bandwidth: Bandwidth is the max amount of information (in units of megabytes per second) that can be transferred past the external memory interface in one second. It is calculated by multiplying the card's bus 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 ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This number is calculated by multiplying the total texture units by the core clock speed of the chip. The higher this number, the better the 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 per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

Comments

5 Responses to “Radeon HD 6770 vs Radeon HD 6850”
erin says:
i like it
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sam says:
i got ati6850 and its more then great, am playing the latest game with rosolution of 1600x900 hightist Settings

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