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Geforce GTX 680 vs Radeon HD 6950 2GB

Intro

The Geforce GTX 680 uses a 28 nm design. nVidia has set the core frequency at 1006 MHz. The GDDR5 RAM runs at a frequency of 1502 MHz on this card. It features 1536 SPUs along with 128 TAUs and 32 ROPs.

Compare those specs to the Radeon HD 6950 2GB, which 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 made up of 1408 SPUs, 88 TAUs, and 32 ROPs.

Display Graphs

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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

In theory, the Geforce GTX 680 should be 20% faster than the Radeon HD 6950 2GB overall, because of its greater data rate. (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 (approximately 83%) better at AF 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 superior to the Radeon HD 6950 2GB, and very much so. (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: Memory bandwidth is the max amount of information (counted in megabytes per second) that can be transferred past the external memory interface within a second. It is worked out by multiplying the card's bus width by its memory speed. If the card has DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the 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 number of texture map elements (texels) that can be processed per second. This figure is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on many 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

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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