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Radeon HD 6950 vs Radeon HD 7870

Intro

The Radeon HD 6950 has clock speeds of 800 MHz on the GPU, and 1250 MHz on the 1024 MB of GDDR5 memory. It features 1408 SPUs as well as 88 Texture Address Units and 32 Rasterization Operator Units.

Compare that to the Radeon HD 7870, which comes with a clock speed of 1000 MHz and a GDDR5 memory speed of 1200 MHz. It also makes use of a 256-bit memory bus, and uses a 28 nm design. It is comprised of 1280 SPUs, 80 Texture Address Units, and 32 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7870 175 Watts
Radeon HD 6950 200 Watts
Difference: 25 Watts (14%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6950 is 4% faster than the Radeon HD 7870 overall, because of its higher data rate. (explain)

Radeon HD 6950 160000 MB/sec
Radeon HD 7870 153600 MB/sec
Difference: 6400 (4%)

Texel Rate

The Radeon HD 7870 will be just a bit (approximately 14%) faster with regards to AF than the Radeon HD 6950. (explain)

Radeon HD 7870 80000 Mtexels/sec
Radeon HD 6950 70400 Mtexels/sec
Difference: 9600 (14%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 7870 is superior to the Radeon HD 6950, by far. (explain)

Radeon HD 7870 32000 Mpixels/sec
Radeon HD 6950 25600 Mpixels/sec
Difference: 6400 (25%)

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 6950

Amazon.com

Radeon HD 7870

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

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Model Radeon HD 6950 Radeon HD 7870
Manufacturer AMD AMD
Year December 2010 March 2012
Code Name Cayman Pro Pitcairn XT
Memory 1024 MB 2048 MB
Core Speed 800 MHz 1000 MHz
Memory Speed 5000 MHz 4800 MHz
Power (Max TDP) 200 watts 175 watts
Bandwidth 160000 MB/sec 153600 MB/sec
Texel Rate 70400 Mtexels/sec 80000 Mtexels/sec
Pixel Rate 25600 Mpixels/sec 32000 Mpixels/sec
Unified Shaders 1408 1280
Texture Mapping Units 88 80
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 40 nm 28 nm
Transistors 2640 million 2800 million
Bus PCIe x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 4.1 OpenGL 4.2

Memory Bandwidth: Memory bandwidth is the largest amount of data (in units of megabytes per second) that can be transported over the external memory interface within a second. The number is worked out by multiplying the interface width by its memory clock speed. In the case of DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

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

Comments

6 Responses to “Radeon HD 6950 vs Radeon HD 7870”
Anonymous says:

the 7870 sapphire OC edition is better

MXM says:

but who are the best 6950 or 7870 ?! for gaming ?!?!?!

Marcel says:

The 6950 are 100x better !!!

Anonymous says:

Useless compare :/

saad says:

the hd 7870 is little bit better then hd 6950 and capable of handling games on full hd 1920x1080 screen resolution and much better than hd 6950

volga says:

the 6950 is a little bit fast than 7870 because of memory bandwith

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