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Radeon HD 6950 2GB vs Radeon HD 7950 3GB

Intro

The Radeon HD 6950 2GB features a core clock frequency of 800 MHz and a GDDR5 memory frequency of 1250 MHz. It also uses a 256-bit memory bus, and uses a 40 nm design. It features 1408 SPUs, 88 TAUs, and 32 Raster Operation Units.

Compare all of that to the Radeon HD 7950 3GB, which makes use of a 28 nm design. AMD has set the core speed at 800 MHz. The GDDR5 RAM works at a frequency of 1250 MHz on this particular card. It features 1792 SPUs along with 112 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Both cards have the same power consumption.

Memory Bandwidth

Theoretically speaking, the Radeon HD 7950 3GB should be much faster than the Radeon HD 6950 2GB in general. (explain)

Radeon HD 7950 3GB 240000 MB/sec
Radeon HD 6950 2GB 160000 MB/sec
Difference: 80000 (50%)

Texel Rate

The Radeon HD 7950 3GB is quite a bit (about 27%) faster with regards to texture filtering than the Radeon HD 6950 2GB. (explain)

Radeon HD 7950 3GB 89600 Mtexels/sec
Radeon HD 6950 2GB 70400 Mtexels/sec
Difference: 19200 (27%)

Pixel Rate

Both cards have the exact same pixel fill rate, so in theory they should be equally good at at full screen anti-aliasing, and be able to handle the same screen resolutions. (explain)

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 6950 2GB

Amazon.com

Radeon HD 7950 3GB

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 6950 2GB Radeon HD 7950 3GB
Manufacturer AMD AMD
Year December 2010 January 2012
Code Name Cayman Pro Tahiti Pro
Memory 2048 MB 3072 MB
Core Speed 800 MHz 800 MHz
Memory Speed 5000 MHz 5000 MHz
Power (Max TDP) 200 watts 200 watts
Bandwidth 160000 MB/sec 240000 MB/sec
Texel Rate 70400 Mtexels/sec 89600 Mtexels/sec
Pixel Rate 25600 Mpixels/sec 25600 Mpixels/sec
Unified Shaders 1408 1792
Texture Mapping Units 88 112
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 384-bit
Fab Process 40 nm 28 nm
Transistors 2640 million 4313 million
Bus PCIe x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 4.1 OpenGL 4.2

Memory Bandwidth: Bandwidth is the maximum amount of information (measured in MB per second) that can be moved across the external memory interface in one second. The number is calculated by multiplying the interface width by the speed of its memory. If it uses DDR memory, the result should 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 anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

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