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Geforce GTX 680 vs Radeon HD 7950 3GB

Intro

The Geforce GTX 680 makes use of a 28 nm design. nVidia has set the core speed at 1006 MHz. The GDDR5 memory runs at a speed of 1502 MHz on this model. It features 1536 SPUs along with 128 Texture Address Units and 32 ROPs.

Compare all that to the Radeon HD 7950 3GB, which features GPU core speed of 800 MHz, and 3072 MB of GDDR5 memory running at 1250 MHz through a 384-bit bus. It also is comprised of 1792 Stream Processors, 112 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Geforce GTX 680 195 Watts
Radeon HD 7950 3GB 200 Watts
Difference: 5 Watts (3%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7950 3GB should perform quite a bit faster than the Geforce GTX 680 overall. (explain)

Radeon HD 7950 3GB 240000 MB/sec
Geforce GTX 680 192256 MB/sec
Difference: 47744 (25%)

Texel Rate

The Geforce GTX 680 should be quite a bit (about 44%) better at AF than the Radeon HD 7950 3GB. (explain)

Geforce GTX 680 128768 Mtexels/sec
Radeon HD 7950 3GB 89600 Mtexels/sec
Difference: 39168 (44%)

Pixel Rate

If using high levels of AA is important to you, then the Geforce GTX 680 is superior to the Radeon HD 7950 3GB, and very much so. (explain)

Geforce GTX 680 32192 Mpixels/sec
Radeon HD 7950 3GB 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

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Radeon HD 7950 3GB

Amazon.com

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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 7950 3GB
Manufacturer nVidia AMD
Year March 2012 January 2012
Code Name GK104 Tahiti Pro
Memory 2048 MB 3072 MB
Core Speed 1006 MHz 800 MHz
Memory Speed 6008 MHz 5000 MHz
Power (Max TDP) 195 watts 200 watts
Bandwidth 192256 MB/sec 240000 MB/sec
Texel Rate 128768 Mtexels/sec 89600 Mtexels/sec
Pixel Rate 32192 Mpixels/sec 25600 Mpixels/sec
Unified Shaders 1536 1792
Texture Mapping Units 128 112
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 384-bit
Fab Process 28 nm 28 nm
Transistors 3540 million 4313 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.0 DirectX 11.1
OpenGL Version OpenGL 4.2 OpenGL 4.2

Memory Bandwidth: Bandwidth is the largest amount of information (counted in megabytes per second) that can be transferred past the external memory interface in one second. It's calculated by multiplying the interface width by its memory speed. If the card has DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster 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 number of texture map elements (texels) that can be applied in one 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 card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

Hide Prices

Geforce GTX 680

Amazon.com

Check prices at:

Radeon HD 7950 3GB

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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