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Radeon HD 6970 vs Radeon HD 7970

Intro

The Radeon HD 6970 comes with core speeds of 880 MHz on the GPU, and 1375 MHz on the 2048 MB of GDDR5 RAM. It features 1536 SPUs as well as 96 Texture Address Units and 32 ROPs.

Compare all that to the Radeon HD 7970, which uses a 28 nm design. AMD has set the core frequency at 925 MHz. The GDDR5 RAM is set to run at a speed of 1375 MHz on this specific card. It features 2048 SPUs as well as 128 TAUs and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Both cards have the same power consumption.

Memory Bandwidth

Theoretically speaking, the Radeon HD 7970 should be much faster than the Radeon HD 6970 overall. (explain)

Radeon HD 7970 264000 MB/sec
Radeon HD 6970 176000 MB/sec
Difference: 88000 (50%)

Texel Rate

The Radeon HD 7970 will be quite a bit (more or less 40%) more effective at AF than the Radeon HD 6970. (explain)

Radeon HD 7970 118400 Mtexels/sec
Radeon HD 6970 84480 Mtexels/sec
Difference: 33920 (40%)

Pixel Rate

The Radeon HD 7970 should be a little bit (approximately 5%) more effective at AA than the Radeon HD 6970, and also will be able to handle higher screen resolutions without losing too much performance. (explain)

Radeon HD 7970 29600 Mpixels/sec
Radeon HD 6970 28160 Mpixels/sec
Difference: 1440 (5%)

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 6970

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

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Model Radeon HD 6970 Radeon HD 7970
Manufacturer AMD AMD
Year December 2010 January 2012
Code Name Cayman XT Tahiti XT
Memory 2048 MB 3072 MB
Core Speed 880 MHz 925 MHz
Memory Speed 5500 MHz 5500 MHz
Power (Max TDP) 250 watts 250 watts
Bandwidth 176000 MB/sec 264000 MB/sec
Texel Rate 84480 Mtexels/sec 118400 Mtexels/sec
Pixel Rate 28160 Mpixels/sec 29600 Mpixels/sec
Unified Shaders 1536 2048
Texture Mapping Units 96 128
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 384-bit
Fab Process 40 nm 28 nm
Transistors 2640 million 4313 million
Bus PCIe x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 4.1 OpenGL 4.2

Memory Bandwidth: Bandwidth is the maximum amount of information (measured in MB per second) that can be moved over the external memory interface in a second. It is worked out by multiplying the card's interface width by its memory clock speed. If it uses DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied per second. This number is calculated by multiplying the total texture units by the core clock speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per 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 Raster Operations Pipelines 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 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 potential to get to the maximum fill rate.

Comments

4 Responses to “Radeon HD 6970 vs Radeon HD 7970”
timmeh says:

lol guys, get a 6970, its a lot cheaper

Some Dude says:

Do want! But still, then I have to invest in a new Mobo, and then it would be about double the price of a 6990

6990 > 7970

vlcrpt[0]r says:

2x 6970 > 6990 > 7970

But they are so loud :S

LunaticGTX says:

get 7970 and replace the cooler with arctic cooler 7970
cheaper than plus 2 or extreme

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