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Radeon HD 5870 vs Radeon HD 6950 2GB

Intro

The Radeon HD 5870 makes use of a 40 nm design. AMD has set the core frequency at 850 MHz. The GDDR5 memory runs at a frequency of 1200 MHz on this model. It features 1600(320x5) SPUs along with 80 Texture Address Units and 32 ROPs.

Compare those specs to the Radeon HD 6950 2GB, which comes with a GPU core clock speed of 800 MHz, and 2048 MB of GDDR5 memory set to run at 1250 MHz through a 256-bit bus. It also features 1408 SPUs, 88 Texture Address Units, and 32 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5870 188 Watts
Radeon HD 6950 2GB 200 Watts
Difference: 12 Watts (6%)

Memory Bandwidth

In theory, the Radeon HD 6950 2GB should perform just a bit faster than the Radeon HD 5870 in general. (explain)

Radeon HD 6950 2GB 160000 MB/sec
Radeon HD 5870 153600 MB/sec
Difference: 6400 (4%)

Texel Rate

The Radeon HD 6950 2GB should be just a bit (more or less 4%) more effective at anisotropic filtering than the Radeon HD 5870. (explain)

Radeon HD 6950 2GB 70400 Mtexels/sec
Radeon HD 5870 68000 Mtexels/sec
Difference: 2400 (4%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 5870 is the winner, not by a very large margin though. (explain)

Radeon HD 5870 27200 Mpixels/sec
Radeon HD 6950 2GB 25600 Mpixels/sec
Difference: 1600 (6%)

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

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Radeon HD 5870

Amazon.com

Check prices at:

Radeon HD 6950 2GB

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 5870 Radeon HD 6950 2GB
Manufacturer AMD AMD
Year September 23, 2009 December 2010
Code Name Cypress XT Cayman Pro
Memory 1024 MB 2048 MB
Core Speed 850 MHz 800 MHz
Memory Speed 4800 MHz 5000 MHz
Power (Max TDP) 188 watts 200 watts
Bandwidth 153600 MB/sec 160000 MB/sec
Texel Rate 68000 Mtexels/sec 70400 Mtexels/sec
Pixel Rate 27200 Mpixels/sec 25600 Mpixels/sec
Unified Shaders 1600(320x5) 1408
Texture Mapping Units 80 88
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 40 nm 40 nm
Transistors 2154 million 2640 million
Bus PCIe 2.1 x16 PCIe x16
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 3.2 OpenGL 4.1

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units 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 is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

Hide Prices

Radeon HD 5870

Amazon.com

Check prices at:

Radeon HD 6950 2GB

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.

Comments

One Response to “Radeon HD 5870 vs Radeon HD 6950 2GB”
Berkut says:

Warning!
ALL of HD5xxx series support OpenGL4.1
Please update the information.
You can see for reference wikipedia "comparison of amd units" page.

Thanks

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