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Radeon HD 6770 vs Radeon HD 6850

Intro

The Radeon HD 6770 features a GPU core clock speed of 900 MHz, and the 512 MB of GDDR5 RAM runs at 1050 MHz through a 128-bit bus. It also is comprised 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 clocked the core speed at 775 MHz. The GDDR5 memory works at a frequency of 1000 MHz on this card. It features 960 SPUs as well as 48 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

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(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

Theoretically, the Radeon HD 6850 should perform quite a bit faster 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 little bit (approximately 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 using lots of anti-aliasing is important to you, then the Radeon HD 6850 is the winner, 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

Display Prices

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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

Display 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
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: Memory bandwidth is the max amount of data (counted in megabytes per second) that can be transferred past 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 must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record 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 clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the 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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