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Radeon HD 7870 vs Radeon HD 7950


The Radeon HD 7870 has a GPU core clock speed of 1000 MHz, and the 2048 MB of GDDR5 memory is set to run at 1200 MHz through a 256-bit bus. It also features 1280 SPUs, 80 Texture Address Units, and 32 Raster Operation Units.

Compare all of that to the Radeon HD 7950, which comes with a clock frequency of 800 MHz and a GDDR5 memory speed of 1250 MHz. It also features a 384-bit memory bus, and makes use of a 28 nm design. It is made up of 1792 SPUs, 112 TAUs, and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7870 175 Watts
Radeon HD 7950 200 Watts
Difference: 25 Watts (14%)

Memory Bandwidth

As far as performance goes, the Radeon HD 7950 should in theory be much superior to the Radeon HD 7870 overall. (explain)

Radeon HD 7950 240000 MB/sec
Radeon HD 7870 153600 MB/sec
Difference: 86400 (56%)

Texel Rate

The Radeon HD 7950 will be a little bit (about 12%) more effective at anisotropic filtering than the Radeon HD 7870. (explain)

Radeon HD 7950 89600 Mtexels/sec
Radeon HD 7870 80000 Mtexels/sec
Difference: 9600 (12%)

Pixel Rate

The Radeon HD 7870 will be much (more or less 25%) better at AA than the Radeon HD 7950, and also should be capable of handling higher screen resolutions while still performing well. (explain)

Radeon HD 7870 32000 Mpixels/sec
Radeon HD 7950 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 7870

Radeon HD 7950

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.


Display Specifications

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Model Radeon HD 7870 Radeon HD 7950
Manufacturer AMD AMD
Year March 2012 January 2012
Code Name Pitcairn XT Tahiti Pro
Memory 2048 MB 1536 MB
Core Speed 1000 MHz 800 MHz
Memory Speed 4800 MHz 5000 MHz
Power (Max TDP) 175 watts 200 watts
Bandwidth 153600 MB/sec 240000 MB/sec
Texel Rate 80000 Mtexels/sec 89600 Mtexels/sec
Pixel Rate 32000 Mpixels/sec 25600 Mpixels/sec
Unified Shaders 1280 1792
Texture Mapping Units 80 112
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 384-bit
Fab Process 28 nm 28 nm
Transistors 2800 million 4313 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.1 DirectX 11.1
OpenGL Version OpenGL 4.2 OpenGL 4.2

Memory Bandwidth: Bandwidth is the maximum amount of information (counted in megabytes per second) that can be transported across the external memory interface in a second. It's calculated by multiplying the interface width by its memory clock speed. In the case of DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.


5 Responses to “Radeon HD 7870 vs Radeon HD 7950”
Kaufberatung: welche HD7870 oder doch welche HD7950 ? - Seite 2 says:

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Anonymous says:


andykush says:

how is the 7950 a better overall card but the 7870 is better at handling higher graphics? HW compare get your info correct cause this makes no sense

admin says:

"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."

ali says:

can anyone help for selecting a card that is compatible with my PC

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