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Radeon HD 7950 vs Radeon HD 7970

Intro

The Radeon HD 7950 comes with a GPU core clock speed of 800 MHz, and the 1536 MB of GDDR5 RAM is set to run at 1250 MHz through a 384-bit bus. It also is comprised of 1792 Stream Processors, 112 TAUs, and 32 Raster Operation Units.

Compare those specs to the Radeon HD 7970, which features a clock speed of 925 MHz and a GDDR5 memory speed of 1375 MHz. It also features a 384-bit memory bus, and makes use of a 28 nm design. It features 2048 SPUs, 128 TAUs, 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

Theoretically, the Radeon HD 7970 should perform a 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%) 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 will be a little bit (about 16%) faster with regards to AA than the Radeon HD 7950, and able to handle higher resolutions while still performing well. (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 max amount of data (in units of megabytes per second) that can be moved past the external memory interface in one second. It is worked out by multiplying the bus width by its memory clock speed. If the card has DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. 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 texture map elements (texels) that are processed in one second. This figure is worked out 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 handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of 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 rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max 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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