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Geforce GTX 680 vs Radeon HD 6950 2GB

Intro

The Geforce GTX 680 has core speeds of 1006 MHz on the GPU, and 1502 MHz on the 2048 MB of GDDR5 memory. It features 1536 SPUs as well as 128 TAUs and 32 ROPs.

Compare that to the Radeon HD 6950 2GB, which makes use of a 40 nm design. AMD has clocked the core frequency at 800 MHz. The GDDR5 memory is set to run at a speed of 1250 MHz on this specific card. It features 1408 SPUs as well as 88 TAUs and 32 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Geforce GTX 680 195 Watts
Radeon HD 6950 2GB 200 Watts
Difference: 5 Watts (3%)

Memory Bandwidth

The Geforce GTX 680 should in theory be a small bit faster than the Radeon HD 6950 2GB overall. (explain)

Geforce GTX 680 192256 MB/sec
Radeon HD 6950 2GB 160000 MB/sec
Difference: 32256 (20%)

Texel Rate

The Geforce GTX 680 will be a lot (more or less 83%) better at anisotropic filtering than the Radeon HD 6950 2GB. (explain)

Geforce GTX 680 128768 Mtexels/sec
Radeon HD 6950 2GB 70400 Mtexels/sec
Difference: 58368 (83%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Geforce GTX 680 is a better choice, by far. (explain)

Geforce GTX 680 32192 Mpixels/sec
Radeon HD 6950 2GB 25600 Mpixels/sec
Difference: 6592 (26%)

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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Geforce GTX 680

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 Geforce GTX 680 Radeon HD 6950 2GB
Manufacturer nVidia AMD
Year March 2012 December 2010
Code Name GK104 Cayman Pro
Memory 2048 MB 2048 MB
Core Speed 1006 MHz 800 MHz
Memory Speed 6008 MHz 5000 MHz
Power (Max TDP) 195 watts 200 watts
Bandwidth 192256 MB/sec 160000 MB/sec
Texel Rate 128768 Mtexels/sec 70400 Mtexels/sec
Pixel Rate 32192 Mpixels/sec 25600 Mpixels/sec
Unified Shaders 1536 1408
Texture Mapping Units 128 88
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 28 nm 40 nm
Transistors 3540 million 2640 million
Bus PCIe 3.0 x16 PCIe x16
DirectX Version DirectX 11.0 DirectX 11
OpenGL Version OpenGL 4.2 OpenGL 4.1

Memory Bandwidth: Bandwidth is the largest amount of data (counted in megabytes per second) that can be moved over the external memory interface within a second. It is worked out by multiplying the interface width by its memory clock speed. If it uses DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better 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 texture map elements (texels) that are applied per second. This number is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The better the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

Hide Prices

Geforce GTX 680

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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