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Radeon HD 6950 2GB vs Radeon HD 6990

Intro

The Radeon HD 6950 2GB comes with core clock speeds of 800 MHz on the GPU, and 1250 MHz on the 2048 MB of GDDR5 RAM. It features 1408 SPUs along with 88 TAUs and 32 ROPs.

Compare that to the Radeon HD 6990, which uses a 40 nm design. AMD has clocked the core speed at 830 MHz. The GDDR5 RAM works at a speed of 1250 MHz on this card. It features 1536 SPUs along with 96 Texture Address Units and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6950 2GB 200 Watts
Radeon HD 6990 375 Watts
Difference: 175 Watts (88%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6990 should be 100% quicker than the Radeon HD 6950 2GB in general, due to its higher data rate. (explain)

Radeon HD 6990 320000 MB/sec
Radeon HD 6950 2GB 160000 MB/sec
Difference: 160000 (100%)

Texel Rate

The Radeon HD 6990 should be a lot (about 126%) better at anisotropic filtering than the Radeon HD 6950 2GB. (explain)

Radeon HD 6990 159360 Mtexels/sec
Radeon HD 6950 2GB 70400 Mtexels/sec
Difference: 88960 (126%)

Pixel Rate

If using a high screen resolution 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 6950 2GB 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 6950 2GB

Amazon.com

Check prices at:

Radeon HD 6990

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 Radeon HD 6950 2GB Radeon HD 6990
Manufacturer AMD AMD
Year December 2010 March 2011
Code Name Cayman Pro Antilles
Memory 2048 MB 2048 MB (x2)
Core Speed 800 MHz 830 MHz (x2)
Memory Speed 5000 MHz 5000 MHz (x2)
Power (Max TDP) 200 watts 375 watts
Bandwidth 160000 MB/sec 320000 MB/sec
Texel Rate 70400 Mtexels/sec 159360 Mtexels/sec
Pixel Rate 25600 Mpixels/sec 53120 Mpixels/sec
Unified Shaders 1408 1536 (x2)
Texture Mapping Units 88 96 (x2)
Render Output Units 32 32 (x2)
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit (x2)
Fab Process 40 nm 40 nm
Transistors 2640 million 2640 million
Bus PCIe x16 PCIe 2.1 x16
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 4.1 OpenGL 4.1

Memory Bandwidth: Bandwidth is the largest amount of information (measured in megabytes per second) that can be transferred past the external memory interface in a second. It is worked out by multiplying the card's interface width by its memory speed. If it uses DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied per second. This figure is calculated by multiplying the total number of texture units by the core clock speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 6950 2GB

Amazon.com

Check prices at:

Radeon HD 6990

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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