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Radeon HD 6770 vs Radeon HD 6850

Intro

The Radeon HD 6770 comes with a GPU clock speed of 900 MHz, and the 512 MB of GDDR5 RAM is set to run at 1050 MHz through a 128-bit bus. It also is comprised of 800 SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Compare that to the Radeon HD 6850, which makes use of a 40 nm design. AMD has set the core frequency at 775 MHz. The GDDR5 memory is set to run at a speed of 1000 MHz on this particular model. It features 960 SPUs as well as 48 TAUs and 32 Rasterization Operator Units.

Display Graphs

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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

Performance-wise, the Radeon HD 6850 should in theory be quite a bit better than the Radeon HD 6770 in general. (explain)

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

Texel Rate

The Radeon HD 6850 will be a bit (about 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 a high resolution is important to you, then the Radeon HD 6850 is a better choice, and very much so. (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

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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

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Model Radeon HD 6770 Radeon HD 6850
Manufacturer AMD AMD
Year January 2011 October 2010
Code Name Juniper XT Barts Pro
Memory 512 MB 1024 MB
Core Speed 900 MHz 775 MHz
Memory Speed 4200 MHz 4000 MHz
Power (Max TDP) 108 watts 127 watts
Bandwidth 67200 MB/sec 128000 MB/sec
Texel Rate 36000 Mtexels/sec 37200 Mtexels/sec
Pixel Rate 14400 Mpixels/sec 24800 Mpixels/sec
Unified Shaders 800 960
Texture Mapping Units 40 48
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 128-bit 256-bit
Fab Process 40 nm 40 nm
Transistors 1040 million 1700 million
Bus PCIe x16 PCIe x16
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 4.1 OpenGL 4.1

Memory Bandwidth: Bandwidth is the max amount of information (counted in MB per second) that can be moved over the external memory interface in a second. It's calculated by multiplying the interface width by its memory speed. If it uses DDR 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 high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Comments

5 Responses to “Radeon HD 6770 vs Radeon HD 6850”
erin says:

i like it

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ATI HD 6770 y 6850 says:

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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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