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Radeon HD 6770 vs Radeon HD 6850

Intro

The Radeon HD 6770 uses a 40 nm design. AMD has set the core frequency at 900 MHz. The GDDR5 memory is set to run at a frequency of 1050 MHz on this particular card. It features 800 SPUs along with 40 TAUs and 16 Rasterization Operator Units.

Compare all of that to the Radeon HD 6850, which features GPU clock speed of 775 MHz, and 1024 MB of GDDR5 memory set to run at 1000 MHz through a 256-bit bus. It also is made up of 960 SPUs, 48 TAUs, and 32 ROPs.

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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

Theoretically speaking, the Radeon HD 6850 should be a lot 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 is a small bit (approximately 3%) better at AF than the Radeon HD 6770. (explain)

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

Pixel Rate

The Radeon HD 6850 is a lot (more or less 72%) more effective at full screen anti-aliasing than the Radeon HD 6770, and also capable of handling higher resolutions more effectively. (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 largest amount of information (counted in megabytes per second) that can be transported across the external memory interface within a second. It is calculated by multiplying the interface width by its memory clock speed. If it uses DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better 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 texture map elements (texels) that can be applied in one second. This number is worked out by multiplying the total texture units of the card by the core speed of the chip. The better this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels 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 the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max 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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