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Radeon HD 6790 vs Radeon HD 6950 2GB

Intro

The Radeon HD 6790 comes with core clock speeds of 840 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 RAM. It features 800 SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.

Compare all of that to the Radeon HD 6950 2GB, which uses a 40 nm design. AMD has clocked the core speed at 800 MHz. The GDDR5 memory works at a speed of 1250 MHz on this card. It features 1408 SPUs as well as 88 Texture Address Units and 32 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6790 150 Watts
Radeon HD 6950 2GB 200 Watts
Difference: 50 Watts (33%)

Memory Bandwidth

Performance-wise, the Radeon HD 6950 2GB should in theory be just a bit better than the Radeon HD 6790 in general. (explain)

Radeon HD 6950 2GB 160000 MB/sec
Radeon HD 6790 134400 MB/sec
Difference: 25600 (19%)

Texel Rate

The Radeon HD 6950 2GB is quite a bit (approximately 110%) more effective at texture filtering than the Radeon HD 6790. (explain)

Radeon HD 6950 2GB 70400 Mtexels/sec
Radeon HD 6790 33600 Mtexels/sec
Difference: 36800 (110%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 6950 2GB is the winner, by far. (explain)

Radeon HD 6950 2GB 25600 Mpixels/sec
Radeon HD 6790 13440 Mpixels/sec
Difference: 12160 (90%)

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 6790

Amazon.com

Check prices at:

Radeon HD 6950 2GB

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.

Specifications

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Model Radeon HD 6790 Radeon HD 6950 2GB
Manufacturer AMD AMD
Year April 2011 December 2010
Code Name Barts LE Cayman Pro
Memory 1024 MB 2048 MB
Core Speed 840 MHz 800 MHz
Memory Speed 4200 MHz 5000 MHz
Power (Max TDP) 150 watts 200 watts
Bandwidth 134400 MB/sec 160000 MB/sec
Texel Rate 33600 Mtexels/sec 70400 Mtexels/sec
Pixel Rate 13440 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 256-bit 256-bit
Fab Process 40 nm 40 nm
Transistors 1700 million 2640 million
Bus PCIe 2.1 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 data (in units of megabytes per second) that can be moved over the external memory interface in one second. It's worked out by multiplying the card's interface width by its memory clock speed. In the case of DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied per second. This figure is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The better the texel rate, the better the video 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 the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output 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.

Display Prices

Hide Prices

Radeon HD 6790

Amazon.com

Check prices at:

Radeon HD 6950 2GB

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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