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Radeon HD 7950 vs Radeon HD 7970

Intro

The Radeon HD 7950 features a GPU core clock speed of 800 MHz, and the 1536 MB of GDDR5 memory is set to run at 1250 MHz through a 384-bit bus. It also is made up of 1792 Stream Processors, 112 TAUs, and 32 ROPs.

Compare those specifications to the Radeon HD 7970, which makes use of a 28 nm design. AMD has set the core speed at 925 MHz. The GDDR5 RAM runs at a frequency of 1375 MHz on this card. It features 2048 SPUs along with 128 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

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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 7970 8225 points
Radeon HD 7950 7731 points
Difference: 494 (6%)

Ethereum Mining Hash Rate

Radeon HD 7950 21 Mh/s
Radeon HD 7970 21 Mh/s
Difference: 0 (0%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7950 200 Watts
Radeon HD 7970 250 Watts
Difference: 50 Watts (25%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7970 should be a small bit faster than the Radeon HD 7950 overall. (explain)

Radeon HD 7970 264000 MB/sec
Radeon HD 7950 240000 MB/sec
Difference: 24000 (10%)

Texel Rate

The Radeon HD 7970 is a lot (about 32%) faster with regards to AF than the Radeon HD 7950. (explain)

Radeon HD 7970 118400 Mtexels/sec
Radeon HD 7950 89600 Mtexels/sec
Difference: 28800 (32%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 7970 is a better choice, not by a very large margin though. (explain)

Radeon HD 7970 29600 Mpixels/sec
Radeon HD 7950 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

Radeon HD 7950

Radeon HD 7970

Specifications

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Model Radeon HD 7950 Radeon HD 7970
Manufacturer AMD AMD
Year January 2012 January 2012
Code Name Tahiti Pro Tahiti XT
Memory 1536 MB 3072 MB
Core Speed 800 MHz 925 MHz
Memory Speed 5000 MHz 5500 MHz
Power (Max TDP) 200 watts 250 watts
Bandwidth 240000 MB/sec 264000 MB/sec
Texel Rate 89600 Mtexels/sec 118400 Mtexels/sec
Pixel Rate 25600 Mpixels/sec 29600 Mpixels/sec
Unified Shaders 1792 2048
Texture Mapping Units 112 128
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 384-bit 384-bit
Fab Process 28 nm 28 nm
Transistors 4313 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 largest amount of information (counted in megabytes per second) that can be moved past the external memory interface in one second. It is calculated by multiplying the bus width by the speed of its memory. If the card has DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

Radeon HD 7950

Radeon HD 7970

Comments

6 Responses to “Radeon HD 7950 vs Radeon HD 7970”
Xnerdz says:

I thought that the HD 7950 had 3GB of memory...

exodus says:

it does..... silllyyyyy

Anon says:

There is a 3GB version of the 7950. It's a separate item on the lists displayed on this site.

Go to the top of the page, click the dropdown lists, select the 3GB version. Now that wasn't hard, was it?

Xnerdz says:

Yeah, I didn't saw it the first time... sorry, my bad.

massive says:

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