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Radeon HD 6950 vs Radeon HD 7850

Intro

The Radeon HD 6950 makes use of a 40 nm design. AMD has set the core frequency at 800 MHz. The GDDR5 RAM works at a speed of 1250 MHz on this card. It features 1408 SPUs as well as 88 TAUs and 32 Rasterization Operator Units.

Compare all of that to the Radeon HD 7850, which uses a 28 nm design. AMD has set the core frequency at 860 MHz. The GDDR5 RAM is set to run at a frequency of 1200 MHz on this card. It features 1024 SPUs along with 64 TAUs and 32 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7850 130 Watts
Radeon HD 6950 200 Watts
Difference: 70 Watts (54%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6950 should be 4% faster than the Radeon HD 7850 overall, due to its greater bandwidth. (explain)

Radeon HD 6950 160000 MB/sec
Radeon HD 7850 153600 MB/sec
Difference: 6400 (4%)

Texel Rate

The Radeon HD 6950 should be a lot (about 28%) better at anisotropic filtering than the Radeon HD 7850. (explain)

Radeon HD 6950 70400 Mtexels/sec
Radeon HD 7850 55040 Mtexels/sec
Difference: 15360 (28%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 7850 is superior to the Radeon HD 6950, not by a very large margin though. (explain)

Radeon HD 7850 27520 Mpixels/sec
Radeon HD 6950 25600 Mpixels/sec
Difference: 1920 (8%)

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 7850

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 7850
Manufacturer AMD AMD
Year December 2010 March 2012
Code Name Cayman Pro Pitcairn Pro
Memory 1024 MB 2048 MB
Core Speed 800 MHz 860 MHz
Memory Speed 5000 MHz 4800 MHz
Power (Max TDP) 200 watts 130 watts
Bandwidth 160000 MB/sec 153600 MB/sec
Texel Rate 70400 Mtexels/sec 55040 Mtexels/sec
Pixel Rate 25600 Mpixels/sec 27520 Mpixels/sec
Unified Shaders 1408 1024
Texture Mapping Units 88 64
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 maximum amount of data (in units of megabytes per second) that can be transported over the external memory interface within a second. It is calculated by multiplying the interface width by its memory speed. If the card has DDR memory, it must be multiplied by 2 again. If 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 amount of texture map elements (texels) that are processed in one second. This number is worked out by multiplying the total texture units by the core clock speed of the chip. The better this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

Comments

3 Responses to “Radeon HD 6950 vs Radeon HD 7850”
HD6950 - www.hardwarezone.com.sg says:

[...] im not gg to OC, so i will get the cheapest i found the comparison between HD6950 vs HD7850 here Radeon HD 6950 vs Radeon HD 7850 – Performance Comparison Benchmarks @ Hardware Compare seems like there are some pros and cons for each model, but the power consumption is kinda draw [...]

saad says:

nice graphics card amd hd 6950

alan verne says:

hd 6950 is better than 7850

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