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Radeon HD 7950 vs Radeon HD 7970

Intro

The Radeon HD 7950 makes use of a 28 nm design. AMD has set the core frequency at 800 MHz. The GDDR5 RAM is set to run at a speed of 1250 MHz on this card. It features 1792 SPUs along with 112 Texture Address Units and 32 ROPs.

Compare that to the Radeon HD 7970, which has clock speeds of 925 MHz on the GPU, and 1375 MHz on the 3072 MB of GDDR5 RAM. It features 2048 SPUs as well as 128 Texture Address Units and 32 ROPs.

(No game benchmarks for this combination yet.)

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

In theory, the Radeon HD 7970 should be 10% quicker than the Radeon HD 7950 overall, because of its greater bandwidth. (explain)

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

Texel Rate

The Radeon HD 7970 will be a lot (about 32%) better at texture filtering than the Radeon HD 7950. (explain)

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

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 7970 is the winner, though not by far. (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

Amazon.com

Radeon HD 7970

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

Model Radeon HD 7950 Radeon HD 7970
Manufacturer AMD AMD
Year January 2012 January 2012
Code Name Tahiti Pro Tahiti XT
Fab Process 28 nm 28 nm
Bus PCIe 3.0 x16 PCIe 3.0 x16
Memory 1536 MB 3072 MB
Core Speed 800 MHz 925 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 1250 MHz (5000 MHz effective) 1375 MHz (5500 MHz effective)
Unified Shaders 1792 2048
Texture Mapping Units 112 128
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 384-bit 384-bit
DirectX Version DirectX 11.1 DirectX 11.1
OpenGL Version OpenGL 4.2 OpenGL 4.2
Power (Max TDP) 200 watts 250 watts
Shader Model 5.0 5.0
Bandwidth 240000 MB/sec 264000 MB/sec
Texel Rate 89600 Mtexels/sec 118400 Mtexels/sec
Pixel Rate 25600 Mpixels/sec 29600 Mpixels/sec

Memory Bandwidth: Bandwidth is the largest amount of data (in units of MB per second) that can be transferred past the external memory interface within a second. It is calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better 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 applied per second. This is worked out 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 in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

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.
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