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Radeon HD 6990 vs Radeon HD 7970

Intro

The Radeon HD 6990 has core speeds of 830 MHz on the GPU, and 1250 MHz on the 2048 MB of GDDR5 RAM. It features 1536 SPUs as well as 96 Texture Address Units and 32 ROPs.

Compare those specifications to the Radeon HD 7970, which features core speeds of 925 MHz on the GPU, and 1375 MHz on the 3072 MB of GDDR5 memory. It features 2048 SPUs along with 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 7970 250 Watts
Radeon HD 6990 375 Watts
Difference: 125 Watts (50%)

Memory Bandwidth

The Radeon HD 6990 should in theory be much faster than the Radeon HD 7970 overall. (explain)

Radeon HD 6990 320000 MB/sec
Radeon HD 7970 264000 MB/sec
Difference: 56000 (21%)

Texel Rate

The Radeon HD 6990 should be quite a bit (approximately 35%) better at AF than the Radeon HD 7970. (explain)

Radeon HD 6990 159360 Mtexels/sec
Radeon HD 7970 118400 Mtexels/sec
Difference: 40960 (35%)

Pixel Rate

The Radeon HD 6990 will be quite a bit (more or less 79%) faster with regards to FSAA than the Radeon HD 7970, and also able to handle higher screen resolutions without slowing down too much. (explain)

Radeon HD 6990 53120 Mpixels/sec
Radeon HD 7970 29600 Mpixels/sec
Difference: 23520 (79%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Radeon HD 6990

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 6990 Radeon HD 7970
Manufacturer AMD AMD
Year March 2011 January 2012
Code Name Antilles Tahiti XT
Fab Process 40 nm 28 nm
Bus PCIe 2.1 x16 PCIe 3.0 x16
Memory 2048 MB (x2) 3072 MB
Core Speed 830 MHz (x2) 925 MHz
Shader Speed N/A MHz (x2) (N/A) MHz
Memory Speed 1250 MHz (5000 MHz effective) (x2) 1375 MHz (5500 MHz effective)
Unified Shaders 1536 (x2) 2048
Texture Mapping Units 96 (x2) 128
Render Output Units 32 (x2) 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit (x2) 384-bit
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 4.1 OpenGL 4.2
Power (Max TDP) 375 watts 250 watts
Shader Model 5.0 5.0
Bandwidth 320000 MB/sec 264000 MB/sec
Texel Rate 159360 Mtexels/sec 118400 Mtexels/sec
Pixel Rate 53120 Mpixels/sec 29600 Mpixels/sec

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

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

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the core 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, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

Comments

8 Responses to “Radeon HD 6990 vs Radeon HD 7970”
SuperKewldude says:
LOL and i was just about to buy a 7970! imma going for a 6990
dgbsf says:
Is Superkewldude retarded?
Lol says:
Dont just look at performance look at the power consumtion too :l
teehee says:
OMG how about 6990 in crossfire!

:P

chuck says:
if you look at the specs, really effective bandwidth would be better on the 7970 because of the PCIe 3.0 (providing you have a PCIe 3.0 compatible board) and it has better open GL 4.2 admittedly its only .1 better but thats the difference between playing BRINK and not playing BRINK.or any other game. and note too that the 6990 here has 2 cores where as the 7970 has one.
[...] que el Crossfire, porque con algunos juegos empeora el rendimiento. Para que te hagas idea: Radeon HD 6990 vs Radeon HD 7970 – Performance Comparison Benchmarks @ Hardware Compare Radeon HD 6950 vs Radeon HD 6990 – Performance Comparison Benchmarks @ Hardware Compare aqui [...]
gamers says:
i think, we should waiting for 7990 :D more fantastic than above.
cheapassgamers says:
I think, we should know that the 7990 :) will be expensive as FUUUUUUUUUUUUUUUUUUUUUUUU

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