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Radeon HD 6950 2GB vs Radeon HD 7870

Intro

The Radeon HD 6950 2GB has a GPU clock speed of 800 MHz, and the 2048 MB of GDDR5 RAM is set to run at 1250 MHz through a 256-bit bus. It also is made up of 1408 Stream Processors, 88 TAUs, and 32 Raster Operation Units.

Compare those specs to the Radeon HD 7870, which has a clock frequency of 1000 MHz and a GDDR5 memory speed of 1200 MHz. It also makes use of a 256-bit memory bus, and makes use of a 28 nm design. It is comprised of 1280 SPUs, 80 TAUs, and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7870 175 Watts
Radeon HD 6950 2GB 200 Watts
Difference: 25 Watts (14%)

Memory Bandwidth

The Radeon HD 6950 2GB should in theory perform a bit faster than the Radeon HD 7870 overall. (explain)

Radeon HD 6950 2GB 160000 MB/sec
Radeon HD 7870 153600 MB/sec
Difference: 6400 (4%)

Texel Rate

The Radeon HD 7870 will be a little bit (approximately 14%) more effective at anisotropic filtering than the Radeon HD 6950 2GB. (explain)

Radeon HD 7870 80000 Mtexels/sec
Radeon HD 6950 2GB 70400 Mtexels/sec
Difference: 9600 (14%)

Pixel Rate

The Radeon HD 7870 should be much (approximately 25%) faster with regards to anti-aliasing than the Radeon HD 6950 2GB, and also able to handle higher screen resolutions more effectively. (explain)

Radeon HD 7870 32000 Mpixels/sec
Radeon HD 6950 2GB 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 2GB

Amazon.com

Check prices at:

Radeon HD 7870

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
Manufacturer AMD AMD
Year December 2010 March 2012
Code Name Cayman Pro Pitcairn XT
Memory 2048 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 maximum amount of data (in units of MB per second) that can be moved over the external memory interface within a second. It's calculated by multiplying the bus width by its memory speed. In the case of DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record 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 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 also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

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Radeon HD 6950 2GB

Amazon.com

Check prices at:

Radeon HD 7870

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.

Comments

One Response to “Radeon HD 6950 2GB vs Radeon HD 7870”
Mshenay says:

With the 7870s OC abilities it does surpass the 6950 by large margins, granted it has less TPU and SPUs but it can clock to 1250 mhz mem and 1200+ Core Clocks. I got a 7870 as an upgrade to my 6950, and I'm happy :3

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