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Radeon HD 6990 vs Radeon HD 7950 3GB

Intro

The Radeon HD 6990 has core speeds of 830 MHz on the GPU, and 1250 MHz on the 2048 MB of GDDR5 RAM. It features 1536 SPUs along with 96 Texture Address Units and 32 ROPs.

Compare that to the Radeon HD 7950 3GB, which uses a 28 nm design. AMD has clocked the core frequency at 800 MHz. The GDDR5 memory is set to run at a frequency of 1250 MHz on this specific model. It features 1792 SPUs as well as 112 TAUs and 32 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7950 3GB 200 Watts
Radeon HD 6990 375 Watts
Difference: 175 Watts (88%)

Memory Bandwidth

As far as performance goes, the Radeon HD 6990 should theoretically be quite a bit better than the Radeon HD 7950 3GB in general. (explain)

Radeon HD 6990 320000 MB/sec
Radeon HD 7950 3GB 240000 MB/sec
Difference: 80000 (33%)

Texel Rate

The Radeon HD 6990 is quite a bit (approximately 78%) more effective at texture filtering than the Radeon HD 7950 3GB. (explain)

Radeon HD 6990 159360 Mtexels/sec
Radeon HD 7950 3GB 89600 Mtexels/sec
Difference: 69760 (78%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 6990 is the winner, and very much so. (explain)

Radeon HD 6990 53120 Mpixels/sec
Radeon HD 7950 3GB 25600 Mpixels/sec
Difference: 27520 (108%)

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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Radeon HD 6990

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 Radeon HD 6990 Radeon HD 7950 3GB
Manufacturer AMD AMD
Year March 2011 January 2012
Code Name Antilles Tahiti Pro
Memory 2048 MB (x2) 3072 MB
Core Speed 830 MHz (x2) 800 MHz
Memory Speed 5000 MHz (x2) 5000 MHz
Power (Max TDP) 375 watts 200 watts
Bandwidth 320000 MB/sec 240000 MB/sec
Texel Rate 159360 Mtexels/sec 89600 Mtexels/sec
Pixel Rate 53120 Mpixels/sec 25600 Mpixels/sec
Unified Shaders 1536 (x2) 1792
Texture Mapping Units 96 (x2) 112
Render Output Units 32 (x2) 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit (x2) 384-bit
Fab Process 40 nm 28 nm
Transistors 2640 million 4313 million
Bus PCIe 2.1 x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 4.1 OpenGL 4.2

Memory Bandwidth: Bandwidth is the largest amount of information (in units of MB per second) that can be moved over the external memory interface in one second. It's calculated by multiplying the card's bus width by its memory speed. In the case of DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. 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 are 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 texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out 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 drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 6990

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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