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Radeon HD 6990 vs Radeon HD 7970

Intro

The Radeon HD 6990 comes with a clock frequency of 830 MHz and a GDDR5 memory speed of 1250 MHz. It also makes use of a 256-bit memory bus, and makes use of a 40 nm design. It is comprised of 1536 SPUs, 96 TAUs, and 32 Raster Operation Units.

Compare those specifications to the Radeon HD 7970, which has GPU clock speed of 925 MHz, and 3072 MB of GDDR5 memory set to run at 1375 MHz through a 384-bit bus. It also is comprised of 2048 Stream Processors, 128 Texture Address Units, and 32 Raster Operation Units.

(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, in theory, should be quite a bit faster than the Radeon HD 7970 in general. (explain)

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

Texel Rate

The Radeon HD 6990 will be quite a bit (approximately 35%) faster with regards to texture filtering than the Radeon HD 7970. (explain)

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

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 6990 is the winner, by a large margin. (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 (counted in MB per second) that can be moved across the external memory interface within a second. It is worked out by multiplying the interface width by its memory clock speed. In the case of DDR memory, it must 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 anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum 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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