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Radeon HD 7870 vs Radeon HD 7950

Intro

The Radeon HD 7870 features a core clock frequency of 1000 MHz and a GDDR5 memory speed of 1200 MHz. It also uses a 256-bit bus, and makes use of a 28 nm design. It is comprised of 1280 SPUs, 80 Texture Address Units, and 32 ROPs.

Compare those specs to the Radeon HD 7950, which makes use of a 28 nm design. AMD has clocked the core frequency at 800 MHz. The GDDR5 RAM works at a frequency of 1250 MHz on this card. It features 1792 SPUs along with 112 TAUs and 32 ROPs.

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

Performance-wise, the Radeon HD 7950 should theoretically be a lot superior to 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 should be a bit (more or less 12%) more effective at texture 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 is quite a bit (more or less 25%) faster with regards to anti-aliasing than the Radeon HD 7950, and able to handle 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

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 max amount of data (counted in megabytes per second) that can be moved past the external memory interface in a second. It is calculated by multiplying the bus width by the speed of its memory. If it uses DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster 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 applied in one second. This is calculated by multiplying the total texture units by the core speed of the chip. The higher the texel rate, 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 maximum number of pixels that the graphics chip could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the the core 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 output rate also depends on many other factors, especially the memory bandwidth - 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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