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Radeon HD 6970 vs Radeon HD 7970

Intro

The Radeon HD 6970 features 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 TAUs and 32 ROPs.

Compare all of that to the Radeon HD 7970, which features a core clock frequency of 925 MHz and a GDDR5 memory speed of 1375 MHz. It also uses a 384-bit memory bus, and uses a 28 nm design. It features 2048 SPUs, 128 Texture Address Units, and 32 Raster Operation Units.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Both cards have the same power consumption.

Memory Bandwidth

Performance-wise, the Radeon HD 7970 should theoretically be much superior to the Radeon HD 6970 in general. (explain)

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

Texel Rate

The Radeon HD 7970 is a lot (approximately 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 will be a bit (about 5%) more effective at FSAA than the Radeon HD 6970, and also capable of handling higher screen resolutions more effectively. (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

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

Model Radeon HD 6970 Radeon HD 7970
Manufacturer AMD AMD
Year December 2010 January 2012
Code Name Cayman XT Tahiti XT
Fab Process 40 nm 28 nm
Bus PCIe x16 PCIe 3.0 x16
Memory 2048 MB 3072 MB
Core Speed 880 MHz 925 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 1375 MHz (5500 MHz effective) 1375 MHz (5500 MHz effective)
Unified Shaders 1536 2048
Texture Mapping Units 96 128
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 384-bit
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 4.1 OpenGL 4.2
Power (Max TDP) 250 watts 250 watts
Shader Model 5.0 5.0
Bandwidth 176000 MB/sec 264000 MB/sec
Texel Rate 84480 Mtexels/sec 118400 Mtexels/sec
Pixel Rate 28160 Mpixels/sec 29600 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the largest amount of data (counted in megabytes per second) that can be transferred past the external memory interface within a second. The number is worked out by multiplying the bus width by its memory speed. In the case of DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach 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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