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Radeon HD 6950 vs Radeon HD 7950

Intro

The Radeon HD 6950 has a core clock speed of 800 MHz and a GDDR5 memory frequency of 1250 MHz. It also features a 256-bit memory bus, and uses a 40 nm design. It features 1408 SPUs, 88 Texture Address Units, and 32 ROPs.

Compare all of that to the Radeon HD 7950, which comes with a clock speed of 800 MHz and a GDDR5 memory speed of 1250 MHz. It also uses a 384-bit memory bus, and makes use of a 28 nm design. It is comprised of 1792 SPUs, 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

Performance-wise, the Radeon HD 7950 should theoretically be a lot better than the Radeon HD 6950 overall. (explain)

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

Texel Rate

The Radeon HD 7950 will be quite a bit (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 exactly the same pixel rate, so theoretically they should be equally good at at anti-aliasing, and be capable of handling 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: Memory bandwidth is the maximum amount of data (measured in MB per second) that can be transported across the external memory interface within a second. It's worked out by multiplying the bus width by its memory speed. If it uses DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, 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 number of texture map elements (texels) that can be applied per second. This is calculated by multiplying the total amount of texture units by the core speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum 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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