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Radeon HD 6990 vs Radeon HD 7970

Intro

The Radeon HD 6990 has a GPU core clock speed of 830 MHz, and the 2048 MB of GDDR5 memory runs at 1250 MHz through a 256-bit bus. It also is comprised of 1536 Stream Processors, 96 Texture Address Units, and 32 Raster Operation Units.

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

Display Graphs

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Radeon HD 7970 8225 points
Radeon HD 6990 5820 points
Difference: 2405 (41%)

Ethereum Mining Hash Rate

Radeon HD 6990 24 Mh/s
Radeon HD 7970 21 Mh/s
Difference: 3 (14%)

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

Theoretically, the Radeon HD 6990 should be a lot 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 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

The Radeon HD 6990 will be a lot (approximately 79%) more effective at anti-aliasing than the Radeon HD 7970, and also will be capable of handling higher screen resolutions more effectively. (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

Radeon HD 7970

Specifications

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Model Radeon HD 6990 Radeon HD 7970
Manufacturer AMD AMD
Year March 2011 January 2012
Code Name Antilles Tahiti XT
Memory 2048 MB (x2) 3072 MB
Core Speed 830 MHz (x2) 925 MHz
Memory Speed 5000 MHz (x2) 5500 MHz
Power (Max TDP) 375 watts 250 watts
Bandwidth 320000 MB/sec 264000 MB/sec
Texel Rate 159360 Mtexels/sec 118400 Mtexels/sec
Pixel Rate 53120 Mpixels/sec 29600 Mpixels/sec
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
Fab Process 40 nm 28 nm
Transistors 2640 million 4313 million
Bus PCIe 2.1 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 max amount of information (in units of megabytes per second) that can be moved over the external memory interface within a second. The number is worked out by multiplying the bus width by its memory clock speed. If the card has DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the 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 number of texture map elements (texels) that are processed in one 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 the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

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

Radeon HD 6990

Radeon HD 7970

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!

😛

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.

Consulta 6950+6970 says:

[...] 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 😀 more fantastic than above.

cheapassgamers says:

I think, we should know that the 7990 🙂 will be expensive as FUUUUUUUUUUUUUUUUUUUUUUUU

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