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Radeon HD 6950 vs Radeon HD 7870

Intro

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

Compare those specifications to the Radeon HD 7870, which comes with a clock frequency of 1000 MHz and a GDDR5 memory speed of 1200 MHz. It also features a 256-bit memory bus, and makes use of a 28 nm design. It is comprised of 1280 SPUs, 80 TAUs, 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

As far as performance goes, the Radeon HD 6950 should theoretically be a little bit superior to the Radeon HD 7870 overall. (explain)

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

Texel Rate

The Radeon HD 7870 is a bit (about 14%) better at texture filtering than the Radeon HD 6950. (explain)

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

Pixel Rate

The Radeon HD 7870 should be quite a bit (more or less 25%) faster with regards to full screen anti-aliasing than the Radeon HD 6950, and also able to handle higher screen resolutions better. (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 (counted in MB per second) that can be moved past the external memory interface in one second. The number is calculated by multiplying the bus width by its memory speed. In the case of DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster 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 amount of texture map elements (texels) that are applied in one second. This figure is worked out by multiplying the total amount of texture units of the card by the core 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 applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly record to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units 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 rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max 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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