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Radeon HD 6770 vs Radeon HD 6970

Intro

The Radeon HD 6770 features a clock frequency of 900 MHz and a GDDR5 memory frequency of 1050 MHz. It also uses a 128-bit memory bus, and uses a 40 nm design. It is comprised of 800 SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Compare those specs to the Radeon HD 6970, which comes with a clock speed of 880 MHz and a GDDR5 memory frequency of 1375 MHz. It also uses a 256-bit memory bus, and uses a 40 nm design. It features 1536 SPUs, 96 Texture Address Units, and 32 ROPs.

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Radeon HD 6970 3470 points
Radeon HD 6770 1520 points
Difference: 1950 (128%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770 108 Watts
Radeon HD 6970 250 Watts
Difference: 142 Watts (131%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6970 should be a lot faster than the Radeon HD 6770 overall. (explain)

Radeon HD 6970 176000 MB/sec
Radeon HD 6770 67200 MB/sec
Difference: 108800 (162%)

Texel Rate

The Radeon HD 6970 will be much (about 135%) more effective at AF than the Radeon HD 6770. (explain)

Radeon HD 6970 84480 Mtexels/sec
Radeon HD 6770 36000 Mtexels/sec
Difference: 48480 (135%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 6970 is the winner, and very much so. (explain)

Radeon HD 6970 28160 Mpixels/sec
Radeon HD 6770 14400 Mpixels/sec
Difference: 13760 (96%)

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

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Radeon HD 6970

Amazon.com

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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 6970
Manufacturer AMD AMD
Year January 2011 December 2010
Code Name Juniper XT Cayman XT
Memory 512 MB 2048 MB
Core Speed 900 MHz 880 MHz
Memory Speed 4200 MHz 5500 MHz
Power (Max TDP) 108 watts 250 watts
Bandwidth 67200 MB/sec 176000 MB/sec
Texel Rate 36000 Mtexels/sec 84480 Mtexels/sec
Pixel Rate 14400 Mpixels/sec 28160 Mpixels/sec
Unified Shaders 800 1536
Texture Mapping Units 40 96
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 128-bit 256-bit
Fab Process 40 nm 40 nm
Transistors 1040 million 2640 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 data (counted in MB per second) that can be transported over the external memory interface within a second. It is calculated by multiplying the card's interface width by its memory speed. If it uses DDR type memory, it should be multiplied by 2 once 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, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied per second. This number is calculated by multiplying the total number of texture units by the core clock 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 applied in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the the core 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 is also dependant 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.

Display Prices

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Radeon HD 6770

Amazon.com

Check prices at:

Radeon HD 6970

Amazon.com

Check prices at:

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.

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