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Radeon HD 6870 vs Radeon HD 6950

Intro

The Radeon HD 6870 has a GPU core clock speed of 900 MHz, and the 1024 MB of GDDR5 memory runs at 1050 MHz through a 256-bit bus. It also is made up of 1120 Stream Processors, 56 TAUs, and 32 Raster Operation Units.

Compare those specs to the Radeon HD 6950, which comes with GPU clock speed of 800 MHz, and 1024 MB of GDDR5 memory set to run at 1250 MHz through a 256-bit bus. It also is comprised of 1408 SPUs, 88 TAUs, and 32 ROPs.

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

Theoretically speaking, the Radeon HD 6950 will be 19% faster than the Radeon HD 6870 overall, due to its greater bandwidth. (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 (about 40%) more effective at AF 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 just a bit (more or less 13%) faster with regards to full screen anti-aliasing than the Radeon HD 6950, and should be capable of handling higher screen resolutions without slowing down too much. (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 data (counted in MB per second) that can be moved over the external memory interface in a second. It's worked out by multiplying the card's interface width by its memory clock speed. In the case of DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This figure is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max 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:

[...] doppio.... ma il monitor non avevi il full hd? puoi tenerlo se funziona il samsung Ma anche no Radeon HD 6870 vs Radeon HD 6950 – Performance Comparison Benchmarks @ Hardware Compare Rispondi [...]

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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