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Radeon HD 7870 vs Radeon HD 7950


Intro

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

Compare those specifications 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 made up of 1792 Stream Processors, 112 TAUs, and 32 ROPs.

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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 7950 7731 points
Radeon HD 7870 6230 points
Difference: 1501 (24%)

Zcash Mining Hash Rate

Radeon HD 7950 235 Sol/s
Radeon HD 7870 172 Sol/s
Difference: 63 (37%)

Ethereum Mining Hash Rate

Radeon HD 7950 21 Mh/s
Radeon HD 7870 16 Mh/s
Difference: 5 (31%)

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

The Radeon HD 7950 should in theory be a lot 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 small bit (more or less 12%) faster with regards to 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

If running with a high resolution is important to you, then the Radeon HD 7870 is the winner, 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
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: Memory bandwidth is the largest amount of information (counted in MB per second) that can be moved across the external memory interface in a second. The number is calculated by multiplying the interface width by the speed of its memory. If it uses DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Display Prices

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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.

Comments

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:

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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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