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Radeon HD 6790 vs Radeon HD 6990

Intro

The Radeon HD 6790 comes with a GPU core speed of 840 MHz, and the 1024 MB of GDDR5 memory is set to run at 1050 MHz through a 256-bit bus. It also features 800 SPUs, 40 Texture Address Units, and 16 ROPs.

Compare those specs to the Radeon HD 6990, which comes with a core clock speed of 830 MHz and a GDDR5 memory frequency of 1250 MHz. It also uses a 256-bit memory bus, and uses a 40 nm design. It is comprised of 1536 SPUs, 96 TAUs, and 32 Raster Operation Units.

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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 6990 5820 points
Radeon HD 6790 2150 points
Difference: 3670 (171%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6790 150 Watts
Radeon HD 6990 375 Watts
Difference: 225 Watts (150%)

Memory Bandwidth

The Radeon HD 6990, in theory, should perform much faster than the Radeon HD 6790 in general. (explain)

Radeon HD 6990 320000 MB/sec
Radeon HD 6790 134400 MB/sec
Difference: 185600 (138%)

Texel Rate

The Radeon HD 6990 will be quite a bit (approximately 374%) faster with regards to texture filtering than the Radeon HD 6790. (explain)

Radeon HD 6990 159360 Mtexels/sec
Radeon HD 6790 33600 Mtexels/sec
Difference: 125760 (374%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 6990 is the winner, by far. (explain)

Radeon HD 6990 53120 Mpixels/sec
Radeon HD 6790 13440 Mpixels/sec
Difference: 39680 (295%)

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

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Radeon HD 6790

Amazon.com

Check prices at:

Radeon HD 6990

Amazon.com

Check prices at:

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 6790 Radeon HD 6990
Manufacturer AMD AMD
Year April 2011 March 2011
Code Name Barts LE Antilles
Memory 1024 MB 2048 MB (x2)
Core Speed 840 MHz 830 MHz (x2)
Memory Speed 4200 MHz 5000 MHz (x2)
Power (Max TDP) 150 watts 375 watts
Bandwidth 134400 MB/sec 320000 MB/sec
Texel Rate 33600 Mtexels/sec 159360 Mtexels/sec
Pixel Rate 13440 Mpixels/sec 53120 Mpixels/sec
Unified Shaders 800 1536 (x2)
Texture Mapping Units 40 96 (x2)
Render Output Units 16 32 (x2)
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit (x2)
Fab Process 40 nm 40 nm
Transistors 1700 million 2640 million
Bus PCIe 2.1 x16 PCIe 2.1 x16
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 4.1 OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the largest amount of information (in units of megabytes per second) that can be transferred across the external memory interface in one second. It's calculated by multiplying the bus width by its memory speed. If it uses DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, 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 texture map elements (texels) that are processed per second. This number 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 card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can 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 card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

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Radeon HD 6790

Amazon.com

Check prices at:

Radeon HD 6990

Amazon.com

Check prices at:

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.

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