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Radeon HD 7950 vs Radeon HD 7970


Intro

The Radeon HD 7950 features a GPU clock speed of 800 MHz, and the 1536 MB of GDDR5 memory runs at 1250 MHz through a 384-bit bus. It also is comprised of 1792 SPUs, 112 Texture Address Units, and 32 Raster Operation Units.

Compare those specifications to the Radeon HD 7970, which comes with a clock frequency of 925 MHz and a GDDR5 memory speed of 1375 MHz. It also makes use of a 384-bit bus, and uses a 28 nm design. It is made up of 2048 SPUs, 128 Texture Address Units, and 32 ROPs.

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 just a bit faster than the Radeon HD 7950 in general. (explain)

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

Texel Rate

The Radeon HD 7970 is quite a bit (approximately 32%) better at anisotropic filtering than the Radeon HD 7950. (explain)

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

Pixel Rate

The Radeon HD 7970 should be a little bit (more or less 16%) better at full screen anti-aliasing than the Radeon HD 7950, and also capable of handling higher resolutions better. (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

Display 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: Memory bandwidth is the largest amount of information (measured in MB per second) that can be moved past the external memory interface in one second. The number is worked out by multiplying the card's interface width by the speed of its memory. In the case of DDR type memory, 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 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 processed in one second. This is calculated by multiplying the total number of 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 texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth - the lower the 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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