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Radeon HD 7870 vs Radeon HD 7950

Intro

The Radeon HD 7870 comes with core speeds of 1000 MHz on the GPU, and 1200 MHz on the 2048 MB of GDDR5 memory. It features 1280 SPUs along with 80 Texture Address Units and 32 ROPs.

Compare all that to the Radeon HD 7950, which has a GPU core clock speed of 800 MHz, and 1536 MB of GDDR5 memory running at 1250 MHz through a 384-bit bus. It also is comprised of 1792 SPUs, 112 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

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(No game benchmarks for this combination yet.)

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

Theoretically speaking, the Radeon HD 7950 should perform quite a bit faster than the Radeon HD 7870 in general. (explain)

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

Texel Rate

The Radeon HD 7950 is a little bit (about 12%) faster with regards to AF than the Radeon HD 7870. (explain)

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

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 7870 is superior to the Radeon HD 7950, and very much so. (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

Amazon.com

Radeon HD 7950

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 7870 Radeon HD 7950
Manufacturer AMD AMD
Year March 2012 January 2012
Code Name Pitcairn XT Tahiti Pro
Fab Process 28 nm 28 nm
Bus PCIe 3.0 x16 PCIe 3.0 x16
Memory 2048 MB 1536 MB
Core Speed 1000 MHz 800 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 4800 MHz 5000 MHz
Unified Shaders 1280 1792
Texture Mapping Units 80 112
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 384-bit
DirectX Version DirectX 11.1 DirectX 11.1
OpenGL Version OpenGL 4.2 OpenGL 4.2
Power (Max TDP) 175 watts 200 watts
Shader Model 5.0 5.0
Bandwidth 153600 MB/sec 240000 MB/sec
Texel Rate 80000 Mtexels/sec 89600 Mtexels/sec
Pixel Rate 32000 Mpixels/sec 25600 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the largest amount of data (in units of megabytes per second) that can be transported across the external memory interface in one second. It is calculated by multiplying the bus width by its memory speed. If it uses DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster 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 figure is calculated by multiplying the total texture units by the core clock speed of the chip. The higher this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.

Comments

5 Responses to “Radeon HD 7870 vs Radeon HD 7950”

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Anonymous says:

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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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