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Radeon HD 6770 vs Radeon HD 6850

Intro

The Radeon HD 6770 has a core clock frequency of 900 MHz and a GDDR5 memory speed of 1050 MHz. It also features a 128-bit bus, and uses a 40 nm design. It features 800 SPUs, 40 TAUs, and 16 ROPs.

Compare those specifications to the Radeon HD 6850, which comes with a core clock frequency of 775 MHz and a GDDR5 memory speed of 1000 MHz. It also makes use of a 256-bit bus, and uses a 40 nm design. It is comprised of 960 SPUs, 48 TAUs, and 32 Raster Operation Units.

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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 will be 90% faster than the Radeon HD 6770 in general, because of its higher data rate. (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 small bit (about 3%) faster with regards to 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 will be much (approximately 72%) faster with regards to full screen anti-aliasing than the Radeon HD 6770, and also will be capable of handling higher screen 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: Memory bandwidth is the largest amount of information (counted in megabytes per second) that can be transferred over the external memory interface within a second. It is calculated by multiplying the card's interface width by its memory speed. If the card has DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This 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 texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly record to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability 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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