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Radeon HD 6870 vs Radeon HD 6950

Intro

The Radeon HD 6870 has core clock speeds of 900 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 memory. It features 1120 SPUs along with 56 TAUs and 32 ROPs.

Compare those specs to the Radeon HD 6950, which uses a 40 nm design. AMD has set the core speed at 800 MHz. The GDDR5 memory is set to run at a speed of 1250 MHz on this specific card. It features 1408 SPUs along with 88 TAUs and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6870 151 Watts
Radeon HD 6950 200 Watts
Difference: 49 Watts (32%)

Memory Bandwidth

In theory, the Radeon HD 6950 is 19% quicker than the Radeon HD 6870 in general, because of its higher data rate. (explain)

Radeon HD 6950 160000 MB/sec
Radeon HD 6870 134400 MB/sec
Difference: 25600 (19%)

Texel Rate

The Radeon HD 6950 should be quite a bit (approximately 40%) more effective at anisotropic filtering than the Radeon HD 6870. (explain)

Radeon HD 6950 70400 Mtexels/sec
Radeon HD 6870 50400 Mtexels/sec
Difference: 20000 (40%)

Pixel Rate

The Radeon HD 6870 will be a bit (approximately 13%) better at anti-aliasing than the Radeon HD 6950, and will be able to handle higher screen resolutions while still performing well. (explain)

Radeon HD 6870 28800 Mpixels/sec
Radeon HD 6950 25600 Mpixels/sec
Difference: 3200 (13%)

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 6870

Amazon.com

Radeon HD 6950

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 6870 Radeon HD 6950
Manufacturer AMD AMD
Year October 2010 December 2010
Code Name Barts XT Cayman Pro
Memory 1024 MB 1024 MB
Core Speed 900 MHz 800 MHz
Memory Speed 4200 MHz 5000 MHz
Power (Max TDP) 151 watts 200 watts
Bandwidth 134400 MB/sec 160000 MB/sec
Texel Rate 50400 Mtexels/sec 70400 Mtexels/sec
Pixel Rate 28800 Mpixels/sec 25600 Mpixels/sec
Unified Shaders 1120 1408
Texture Mapping Units 56 88
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 40 nm 40 nm
Transistors 1700 million 2640 million
Bus PCIe x16 PCIe x16
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 4.1 OpenGL 4.1

Memory Bandwidth: Bandwidth is the maximum amount of information (in units of megabytes per second) that can be moved across the external memory interface in one second. It's calculated by multiplying the card's bus width by its memory speed. If the card has DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This figure is worked out by multiplying the total number of texture units 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 one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

Comments

5 Responses to “Radeon HD 6870 vs Radeon HD 6950”
HD 6950 oder HD 6870 ? says:

[...] oder HD 6870 ? Im schnitt haste 18fps mehr, je nach spiel. Enstspricht in etwa 11%. Quelle:Radeon HD 6870 vs Radeon HD 6950 – Performance Comparison Benchmarks @ Hardware Compare Phenom II 955 3.2Ghz@Mugen 2 Rev.b/Asus M4A87TD EVO/ Corsair 8Gb DDR 3-1333/Sapphire HD [...]

Help me with my build!!! ;) - Project Reality Forums says:

[...] HD 6950 ($230 @newegg) About an $70 dollar price difference on newegg.com Here is a comparison: Radeon HD 6870 vs Radeon HD 6950 ? Performance Comparison Benchmarks @ Hardware Compare Here is the PassMark for the 6870: PassMark - Radeon HD 6870 - Price performance comparison And [...]

PC GAMING 550 EURO says:

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pp965 says:

I have HIS HD 6950.
I really like it.

Koala says:

i have the Powercolor HD6950 fucking love the card

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