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Radeon HD 6950 vs Radeon HD 7870 XT

Intro

The Radeon HD 6950 features a clock speed of 800 MHz and a GDDR5 memory frequency of 1250 MHz. It also makes use of a 256-bit bus, and makes use of a 40 nm design. It features 1408 SPUs, 88 Texture Address Units, and 32 ROPs.

Compare those specs to the Radeon HD 7870 XT, which features GPU clock speed of 925 MHz, and 2048 MB of GDDR5 memory running at 1500 MHz through a 256-bit bus. It also is comprised of 1536 SPUs, 96 Texture Address Units, and 32 Raster Operation Units.

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Radeon HD 7870 XT 6390 points
Radeon HD 6950 3240 points
Difference: 3150 (97%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7870 XT 185 Watts
Radeon HD 6950 200 Watts
Difference: 15 Watts (8%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7870 XT should be 20% faster than the Radeon HD 6950 in general, due to its greater bandwidth. (explain)

Radeon HD 7870 XT 192000 MB/sec
Radeon HD 6950 160000 MB/sec
Difference: 32000 (20%)

Texel Rate

The Radeon HD 7870 XT should be a lot (approximately 26%) faster with regards to texture filtering than the Radeon HD 6950. (explain)

Radeon HD 7870 XT 88800 Mtexels/sec
Radeon HD 6950 70400 Mtexels/sec
Difference: 18400 (26%)

Pixel Rate

The Radeon HD 7870 XT should be a small bit (more or less 16%) better at FSAA than the Radeon HD 6950, and also capable of handling higher screen resolutions better. (explain)

Radeon HD 7870 XT 29600 Mpixels/sec
Radeon HD 6950 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

Amazon.com

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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 Radeon HD 7870 XT
Manufacturer AMD AMD
Year December 2010 November 2012
Code Name Cayman Pro Tahiti LE
Memory 1024 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: Bandwidth is the largest amount of data (in units of megabytes per second) that can be moved across the external memory interface in one second. The number is worked out by multiplying the interface width by its memory speed. In the case of DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

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

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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