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Geforce GTX 690 vs Radeon HD 7950 3GB

Intro

The Geforce GTX 690 makes use of a 28 nm design. nVidia has clocked the core frequency at 915 MHz. The GDDR5 RAM runs at a frequency of 1502 MHz on this particular model. It features 1536 SPUs along with 128 TAUs and 32 Rasterization Operator Units.

Compare that to the Radeon HD 7950 3GB, which comes with core clock speeds of 800 MHz on the GPU, and 1250 MHz on the 3072 MB of GDDR5 memory. It features 1792 SPUs as well as 112 TAUs and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7950 3GB 200 Watts
Geforce GTX 690 300 Watts
Difference: 100 Watts (50%)

Memory Bandwidth

Performance-wise, the Geforce GTX 690 should in theory be quite a bit superior to the Radeon HD 7950 3GB overall. (explain)

Geforce GTX 690 384512 MB/sec
Radeon HD 7950 3GB 240000 MB/sec
Difference: 144512 (60%)

Texel Rate

The Geforce GTX 690 will be a lot (more or less 161%) faster with regards to AF than the Radeon HD 7950 3GB. (explain)

Geforce GTX 690 234240 Mtexels/sec
Radeon HD 7950 3GB 89600 Mtexels/sec
Difference: 144640 (161%)

Pixel Rate

The Geforce GTX 690 will be a lot (approximately 129%) better at anti-aliasing than the Radeon HD 7950 3GB, and also should be able to handle higher resolutions more effectively. (explain)

Geforce GTX 690 58560 Mpixels/sec
Radeon HD 7950 3GB 25600 Mpixels/sec
Difference: 32960 (129%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

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Geforce GTX 690

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.

Specifications

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Model Geforce GTX 690 Radeon HD 7950 3GB
Manufacturer nVidia AMD
Year April 2012 January 2012
Code Name GK104 Tahiti Pro
Memory 2048 MB (x2) 3072 MB
Core Speed 915 MHz (x2) 800 MHz
Memory Speed 6008 MHz (x2) 5000 MHz
Power (Max TDP) 300 watts 200 watts
Bandwidth 384512 MB/sec 240000 MB/sec
Texel Rate 234240 Mtexels/sec 89600 Mtexels/sec
Pixel Rate 58560 Mpixels/sec 25600 Mpixels/sec
Unified Shaders 1536 (x2) 1792
Texture Mapping Units 128 (x2) 112
Render Output Units 32 (x2) 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit (x2) 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: Memory bandwidth is the maximum amount of information (measured in megabytes per second) that can be transferred past the external memory interface in one second. It is calculated by multiplying the interface width by the speed of its memory. If it uses DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total amount of texture units 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 amount of pixels that the graphics chip could possibly record to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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Geforce GTX 690

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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