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Radeon HD 6990 vs Radeon HD 7990

Intro

The Radeon HD 6990 comes with 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 specs to the Radeon HD 7990, which has clock speeds of 950 MHz on the GPU, and 1500 MHz on the 3072 MB of GDDR5 RAM. It features 2048 SPUs as well as 128 Texture Address Units and 32 Rasterization Operator 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 7990 15520 points
Radeon HD 6990 5820 points
Difference: 9700 (167%)

Ethereum Mining Hash Rate

Radeon HD 7990 32 Mh/s
Radeon HD 6990 24 Mh/s
Difference: 8 (33%)

Power Usage and Theoretical Benchmarks

Both cards have the same power consumption.

Memory Bandwidth

The Radeon HD 7990 should theoretically perform a lot faster than the Radeon HD 6990 in general. (explain)

Radeon HD 7990 576000 MB/sec
Radeon HD 6990 320000 MB/sec
Difference: 256000 (80%)

Texel Rate

The Radeon HD 7990 will be much (approximately 53%) faster with regards to texture filtering than the Radeon HD 6990. (explain)

Radeon HD 7990 243200 Mtexels/sec
Radeon HD 6990 159360 Mtexels/sec
Difference: 83840 (53%)

Pixel Rate

The Radeon HD 7990 will be just a bit (approximately 14%) faster with regards to full screen anti-aliasing than the Radeon HD 6990, and also will be able to handle higher resolutions without losing too much performance. (explain)

Radeon HD 7990 60800 Mpixels/sec
Radeon HD 6990 53120 Mpixels/sec
Difference: 7680 (14%)

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 6990

Amazon.com

Check prices at:

Radeon HD 7990

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 6990 Radeon HD 7990
Manufacturer AMD AMD
Year March 2011 April 2013
Code Name Antilles Malta
Memory 2048 MB (x2) 3072 MB (x2)
Core Speed 830 MHz (x2) 950 MHz (x2)
Memory Speed 5000 MHz (x2) 6000 MHz (x2)
Power (Max TDP) 375 watts 375 watts
Bandwidth 320000 MB/sec 576000 MB/sec
Texel Rate 159360 Mtexels/sec 243200 Mtexels/sec
Pixel Rate 53120 Mpixels/sec 60800 Mpixels/sec
Unified Shaders 1536 (x2) 2048 (x2)
Texture Mapping Units 96 (x2) 128 (x2)
Render Output Units 32 (x2) 32 (x2)
Bus Type GDDR5 GDDR5
Bus Width 256-bit (x2) 384-bit (x2)
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 4.3

Memory Bandwidth: Memory bandwidth is the max amount of information (in units of MB per second) that can be moved over the external memory interface in one second. The number is worked out by multiplying the card's interface width by its memory speed. If the card has DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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Radeon HD 6990

Amazon.com

Check prices at:

Radeon HD 7990

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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