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Geforce GTX 680 vs Radeon HD 7950

Intro

The Geforce GTX 680 comes with a GPU clock speed of 1006 MHz, and the 2048 MB of GDDR5 RAM runs at 1502 MHz through a 256-bit bus. It also features 1536 Stream Processors, 128 Texture Address Units, and 32 Raster Operation Units.

Compare all of that to the Radeon HD 7950, which uses a 28 nm design. ATi has set the core frequency at 800 MHz. The GDDR5 RAM works at a speed of 1250 MHz on this particular card. It features 1792 SPUs along with 112 TAUs and 32 ROPs.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

In theory, the Radeon HD 7950 is 25% faster than the Geforce GTX 680 in general, because of its greater bandwidth. (explain)

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

Texel Rate

The Geforce GTX 680 will be a lot (more or less 44%) more effective at texture filtering than the Radeon HD 7950. (explain)

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

Pixel Rate

If running with high levels of AA is important to you, then the Geforce GTX 680 is superior to the Radeon HD 7950, by far. (explain)

Geforce GTX 680 32192 Mpixels/sec
Radeon HD 7950 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

Please note that the price comparisons are based on search keywords, and might not be the exact same card listed on this page. We have no control over the accuracy of their search results.

Geforce GTX 680

Amazon.com

Other US-based stores

Radeon HD 7950

Amazon.com

Other US-based stores

Specifications

Model Geforce GTX 680 Radeon HD 7950
Manufacturer nVidia ATi
Year March 2012 January 2012
Code Name GK104 Tahiti Pro
Fab Process 28 nm 28 nm
Bus PCIe 3.0 x16 PCIe 3.0 x16
Memory 2048 MB 1536 MB
Core Speed 1006 MHz 800 MHz
Shader Speed 1006 MHz (N/A) MHz
Memory Speed 1502 MHz (6008 MHz effective) 1250 MHz (5000 MHz effective)
Unified Shaders 1536 1792
Texture Mapping Units 128 112
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 384-bit
DirectX Version DirectX 11.1 DirectX 11.1
OpenGL Version OpenGL 4.2 OpenGL 4.2
Power (Max TDP) 195 watts 200 watts
Shader Model 5.0 5.0
Bandwidth 192256 MB/sec 240000 MB/sec
Texel Rate 128768 Mtexels/sec 89600 Mtexels/sec
Pixel Rate 32192 Mpixels/sec 25600 Mpixels/sec

Memory Bandwidth: Bandwidth is the maximum amount of information (counted in MB per second) that can be transferred across the external memory interface in a second. The number is calculated by multiplying the bus width by its memory clock speed. If it uses DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 per second. This is calculated by multiplying the total texture units of the card by the core speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Comments

2 Responses to “Geforce GTX 680 vs Radeon HD 7950”
[...] ist es an sich mit der Grafikkarte. Hier mal ein kleiner Benchmark Vergleich der beiden Karten: GTX 680 vs. HD 7950 Bis auf das wirklich schon l├Ącherliche Netzteil (das 400W) ist der Rest an sich reine [...]
daddy'sbackyoubeaches says:
AMD cards are only great at general computation. Nvidia always wins in raster performance.

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