A Question

Compare any two graphics cards:
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Radeon HD 6950 vs Radeon HD 7950

Intro

The Radeon HD 6950 uses a 40 nm design. AMD has set the core speed at 800 MHz. The GDDR5 RAM is set to run at a frequency of 1250 MHz on this model. It features 1408 SPUs along with 88 TAUs and 32 ROPs.

Compare those specifications to the Radeon HD 7950, which uses a 28 nm design. AMD has clocked the core speed at 800 MHz. The GDDR5 memory runs at a frequency of 1250 MHz on this specific model. It features 1792 SPUs along with 112 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

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(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Both cards have the same power consumption.

Memory Bandwidth

In theory, the Radeon HD 7950 should be 50% faster than the Radeon HD 6950 in general, because of its greater bandwidth. (explain)

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

Texel Rate

The Radeon HD 7950 should be a lot (approximately 27%) more effective at AF 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 the exact same pixel fill rate, so in theory they should be equally good at at AA, and be capable of handling the same screen 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

Display Prices

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Radeon HD 6950

Amazon.com

Radeon HD 7950

Amazon.com

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

Display Specifications

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Model Radeon HD 6950 Radeon HD 7950
Manufacturer AMD AMD
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 5000 MHz 5000 MHz
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: Memory bandwidth is the maximum amount of data (in units of MB per second) that can be transported across the external memory interface in one second. It's worked out by multiplying the interface width by its memory speed. If it uses DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster 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 can be processed in one second. This is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability 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

Considering an upgrade. - Hardware Canucks says:

[...] 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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