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Radeon HD 6950 vs Radeon HD 7950

Intro

The Radeon HD 6950 makes use of a 40 nm design. ATi has set the core speed at 800 MHz. The GDDR5 memory is set to run at a speed of 1250 MHz on this specific card. It features 1408 SPUs along with 88 Texture Address Units and 32 Rasterization Operator Units.

Compare that to the Radeon HD 7950, which makes use of a 28 nm design. ATi has set the core frequency at 800 MHz. The GDDR5 RAM is set to run at a frequency of 1250 MHz on this particular card. It features 1792 SPUs along with 112 TAUs and 32 ROPs.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Both cards have the same power consumption.

Memory Bandwidth

The Radeon HD 7950, in theory, should perform a lot faster than the Radeon HD 6950 in general. (explain)

Radeon HD 7950 240000 MB/sec
Radeon HD 6950 160000 MB/sec
Difference: 80000 (50%)

Texel Rate

The Radeon HD 7950 is much (about 27%) better at anisotropic filtering than the Radeon HD 6950. (explain)

Radeon HD 7950 89600 Mtexels/sec
Radeon HD 6950 70400 Mtexels/sec
Difference: 19200 (27%)

Pixel Rate

Both cards have exactly the same pixel rate, so in theory they should be equally good at at anti-aliasing, and be able to handle the same resolutions. (explain)

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

Please note that the price comparisons are based on search keywords, and might not be the exact same card listed on this page. We have no control over the accuracy of their search results.

Radeon HD 6950

Amazon.com

Other US-based stores

Radeon HD 7950

Amazon.com

Other US-based stores

Specifications

Model Radeon HD 6950 Radeon HD 7950
Manufacturer ATi ATi
Year December 2010 January 2012
Code Name Cayman Pro Tahiti Pro
Fab Process 40 nm 28 nm
Bus PCIe x16 PCIe 3.0 x16
Memory 1024 MB 1536 MB
Core Speed 800 MHz 800 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 1250 MHz (5000 MHz effective) 1250 MHz (5000 MHz effective)
Unified Shaders 1408 1792
Texture Mapping Units 88 112
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 384-bit
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 4.1 OpenGL 4.2
Power (Max TDP) 200 watts 200 watts
Shader Model 5.0 5.0
Bandwidth 160000 MB/sec 240000 MB/sec
Texel Rate 70400 Mtexels/sec 89600 Mtexels/sec
Pixel Rate 25600 Mpixels/sec 25600 Mpixels/sec

Memory Bandwidth: Bandwidth is the max amount of data (counted in megabytes per second) that can be transported across the external memory interface in one second. The number is worked out by multiplying the interface width by the speed of its memory. In the case of DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. 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 number is worked out by multiplying the total amount of texture units by the core speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

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

Comments

3 Responses to “Radeon HD 6950 vs Radeon HD 7950”
Anonymous says:
both are great cards with respect to their bandwith and raster operations
[...] Radeon HD 6950 vs Radeon HD 7950 – Performance Comparison Benchmarks @ Hardware Compare What applications are you using? Like others have said, if squeezing out out every last FPS you can and benchmarks are important to you, it'll be an improvement. Doubt you'll see much of a noticeable improvement outside of that in most real-world applications. But if you have money to burn, go for what makes you happy. [...]
MXM says:
yaa but who are the best ?!! Radeon HD 6950 vs Radeon HD 7950 ?!?!

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