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Radeon HD 6950 2GB vs Radeon HD 7950 3GB


The Radeon HD 6950 2GB comes with a clock speed of 800 MHz and a GDDR5 memory speed of 1250 MHz. It also uses a 256-bit memory bus, and makes use of a 40 nm design. It is comprised of 1408 SPUs, 88 Texture Address Units, and 32 Raster Operation Units.

Compare those specifications to the Radeon HD 7950 3GB, which comes with core clock speeds of 800 MHz on the GPU, and 1250 MHz on the 3072 MB of GDDR5 RAM. It features 1792 SPUs as well as 112 Texture Address Units and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Both cards have the same power consumption.

Memory Bandwidth

The Radeon HD 7950 3GB should in theory perform 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 should be quite a bit (approximately 27%) faster with regards to AF 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 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

Radeon HD 7950 3GB

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.


Display 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 data (measured in MB per second) that can be transferred across the external memory interface in a second. It is calculated by multiplying the interface width by its memory speed. If the card has DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This is worked out by multiplying the total number of texture units by the core clock speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly record to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.


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