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Radeon HD 6950 2GB vs Radeon HD 7870 XT

Intro

The Radeon HD 6950 2GB features core clock speeds of 800 MHz on the GPU, and 1250 MHz on the 2048 MB of GDDR5 RAM. It features 1408 SPUs as well as 88 TAUs and 32 ROPs.

Compare that to the Radeon HD 7870 XT, which features core clock speeds of 925 MHz on the GPU, and 1500 MHz on the 2048 MB of GDDR5 memory. It features 1536 SPUs as well as 96 Texture Address Units and 32 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7870 XT 185 Watts
Radeon HD 6950 2GB 200 Watts
Difference: 15 Watts (8%)

Memory Bandwidth

Performance-wise, the Radeon HD 7870 XT should in theory be a little bit superior to the Radeon HD 6950 2GB in general. (explain)

Radeon HD 7870 XT 192000 MB/sec
Radeon HD 6950 2GB 160000 MB/sec
Difference: 32000 (20%)

Texel Rate

The Radeon HD 7870 XT will be much (approximately 26%) better at anisotropic filtering than the Radeon HD 6950 2GB. (explain)

Radeon HD 7870 XT 88800 Mtexels/sec
Radeon HD 6950 2GB 70400 Mtexels/sec
Difference: 18400 (26%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 7870 XT is the winner, but it probably won't make a huge difference. (explain)

Radeon HD 7870 XT 29600 Mpixels/sec
Radeon HD 6950 2GB 25600 Mpixels/sec
Difference: 4000 (16%)

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 2GB

Amazon.com

Check prices at:

Radeon HD 7870 XT

Amazon.com

Check prices at:

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 2GB Radeon HD 7870 XT
Manufacturer AMD AMD
Year December 2010 November 2012
Code Name Cayman Pro Tahiti LE
Memory 2048 MB 2048 MB
Core Speed 800 MHz 925 MHz
Memory Speed 5000 MHz 6000 MHz
Power (Max TDP) 200 watts 185 watts
Bandwidth 160000 MB/sec 192000 MB/sec
Texel Rate 70400 Mtexels/sec 88800 Mtexels/sec
Pixel Rate 25600 Mpixels/sec 29600 Mpixels/sec
Unified Shaders 1408 1536
Texture Mapping Units 88 96
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 40 nm 28 nm
Transistors 2640 million 4313 million
Bus PCIe x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 4.1 OpenGL 4.3

Memory Bandwidth: Bandwidth is the max amount of information (counted in MB per second) that can be moved across the external memory interface in one second. The number is calculated by multiplying the bus width by its memory clock speed. If the card has DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher 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 can be applied per second. This is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The higher the texel rate, the better the card will be at handling 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 that the graphics chip can possibly record to its local memory per 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 - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

Hide Prices

Radeon HD 6950 2GB

Amazon.com

Check prices at:

Radeon HD 7870 XT

Amazon.com

Check prices at:

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.

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