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Radeon HD 6770 vs Radeon HD 6950

Intro

The Radeon HD 6770 comes with a GPU core speed of 900 MHz, and the 512 MB of GDDR5 memory runs at 1050 MHz through a 128-bit bus. It also features 800 SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Compare all that to the Radeon HD 6950, which comes with a core clock speed of 800 MHz and a GDDR5 memory frequency of 1250 MHz. It also makes use of a 256-bit memory bus, and uses a 40 nm design. It is comprised of 1408 SPUs, 88 Texture Address Units, and 32 Raster Operation Units.

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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 6950 3240 points
Radeon HD 6770 1520 points
Difference: 1720 (113%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770 108 Watts
Radeon HD 6950 200 Watts
Difference: 92 Watts (85%)

Memory Bandwidth

The Radeon HD 6950, in theory, should be quite a bit faster than the Radeon HD 6770 in general. (explain)

Radeon HD 6950 160000 MB/sec
Radeon HD 6770 67200 MB/sec
Difference: 92800 (138%)

Texel Rate

The Radeon HD 6950 is quite a bit (about 96%) faster with regards to anisotropic filtering than the Radeon HD 6770. (explain)

Radeon HD 6950 70400 Mtexels/sec
Radeon HD 6770 36000 Mtexels/sec
Difference: 34400 (96%)

Pixel Rate

The Radeon HD 6950 should be a lot (more or less 78%) faster with regards to full screen anti-aliasing than the Radeon HD 6770, and also capable of handling higher resolutions without losing too much performance. (explain)

Radeon HD 6950 25600 Mpixels/sec
Radeon HD 6770 14400 Mpixels/sec
Difference: 11200 (78%)

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 6950

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 6950
Manufacturer AMD AMD
Year January 2011 December 2010
Code Name Juniper XT Cayman Pro
Memory 512 MB 1024 MB
Core Speed 900 MHz 800 MHz
Memory Speed 4200 MHz 5000 MHz
Power (Max TDP) 108 watts 200 watts
Bandwidth 67200 MB/sec 160000 MB/sec
Texel Rate 36000 Mtexels/sec 70400 Mtexels/sec
Pixel Rate 14400 Mpixels/sec 25600 Mpixels/sec
Unified Shaders 800 1408
Texture Mapping Units 40 88
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 maximum amount of information (counted in MB per second) that can be moved past the external memory interface in one second. The number is worked out by multiplying the card's bus width by its memory clock speed. If it uses DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better this number, the better the video 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 amount of pixels that the graphics chip could possibly record to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

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Radeon HD 6770

Amazon.com

Check prices at:

Radeon HD 6950

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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