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Radeon HD 6950 2GB vs Radeon HD 6990

Intro

The Radeon HD 6950 2GB has a core clock frequency of 800 MHz and a GDDR5 memory speed of 1250 MHz. It also makes use of a 256-bit bus, and uses a 40 nm design. It is comprised of 1408 SPUs, 88 TAUs, and 32 ROPs.

Compare all that to the Radeon HD 6990, which features a clock frequency of 830 MHz and a GDDR5 memory speed of 1250 MHz. It also makes use of a 256-bit bus, and uses a 40 nm design. It is made up of 1536 SPUs, 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

As far as performance goes, the Radeon HD 6990 should in theory be much better than the Radeon HD 6950 2GB overall. (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 quite a bit (about 126%) better at AF 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 high levels of AA is important to you, then the Radeon HD 6990 is the winner, by far. (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 max amount of data (measured in megabytes per second) that can be moved over the external memory interface in one second. It is calculated by multiplying the card's interface width by its memory speed. If the card has DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied per second. This figure is worked out by multiplying the total texture units of the card by the core clock 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 per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly record to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max 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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