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Radeon HD 6950 2GB vs Radeon HD 7870 XT

Intro

The Radeon HD 6950 2GB features a GPU core clock speed of 800 MHz, and the 2048 MB of GDDR5 memory runs at 1250 MHz through a 256-bit bus. It also is comprised of 1408 SPUs, 88 Texture Address Units, and 32 ROPs.

Compare those specifications to the Radeon HD 7870 XT, which features a clock speed of 925 MHz and a GDDR5 memory frequency of 1500 MHz. It also makes use of a 256-bit memory bus, and makes use of a 28 nm design. It is made up of 1536 SPUs, 96 Texture Address Units, and 32 Raster Operation 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 theoretically 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 is much (about 26%) faster with regards to texture 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

The Radeon HD 7870 XT should be a little bit (approximately 16%) better at FSAA than the Radeon HD 6950 2GB, and also capable of handling higher screen resolutions more effectively. (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: Memory bandwidth is the maximum amount of information (measured in megabytes per second) that can be transported over the external memory interface within a second. It is calculated by multiplying the bus width by the speed of its memory. If it uses DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This figure is worked out by multiplying the total number of texture units by the core clock speed of the chip. The higher the texel rate, 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 that the graphics chip can possibly record to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential 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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