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Geforce GTX 680 vs Radeon HD 6950

Intro

The Geforce GTX 680 uses a 28 nm design. nVidia has set the core frequency at 1006 MHz. The GDDR5 memory works at a frequency of 1502 MHz on this specific model. It features 1536 SPUs as well as 128 Texture Address Units and 32 Rasterization Operator Units.

Compare those specs to the Radeon HD 6950, which features a clock frequency of 800 MHz and a GDDR5 memory frequency of 1250 MHz. It also uses a 256-bit bus, and makes use of a 40 nm design. It is comprised of 1408 SPUs, 88 Texture Address Units, and 32 ROPs.

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Geforce GTX 680 7650 points
Radeon HD 6950 3240 points
Difference: 4410 (136%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Geforce GTX 680 195 Watts
Radeon HD 6950 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 in general. (explain)

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

Texel Rate

The Geforce GTX 680 should be a lot (approximately 83%) better at texture filtering than the Radeon HD 6950. (explain)

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

Pixel Rate

The Geforce GTX 680 is a lot (about 26%) more effective at full screen anti-aliasing than the Radeon HD 6950, and capable of handling higher screen resolutions better. (explain)

Geforce GTX 680 32192 Mpixels/sec
Radeon HD 6950 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

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
Manufacturer nVidia AMD
Year March 2012 December 2010
Code Name GK104 Cayman Pro
Memory 2048 MB 1024 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 information (counted in megabytes per second) that can be transferred over the external memory interface in a second. It is calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied in one second. This is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The better this number, the better the graphics 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 most pixels that the graphics chip could possibly write to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

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Geforce GTX 680

Amazon.com

Check prices at:

Radeon HD 6950

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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