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Radeon HD 7990 vs Radeon Pro Duo

Intro

The Radeon HD 7990 uses a 28 nm design. AMD has set the core frequency at 950 MHz. The GDDR5 memory runs at a frequency of 1500 MHz on this card. It features 2048 SPUs along with 128 TAUs and 32 Rasterization Operator Units.

Compare all of that to the Radeon Pro Duo, which features GPU core speed of 1000 MHz, and 4096 MB of HBM RAM running at 500 MHz through a 4096-bit bus. It also features 4096 SPUs, 256 TAUs, and 64 ROPs.

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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 Pro Duo 27167 points
Radeon HD 7990 15520 points
Difference: 11647 (75%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon Pro Duo 350 Watts
Radeon HD 7990 375 Watts
Difference: 25 Watts (7%)

Memory Bandwidth

The Radeon Pro Duo should in theory be a lot faster than the Radeon HD 7990 in general. (explain)

Radeon Pro Duo 1024000 MB/sec
Radeon HD 7990 576000 MB/sec
Difference: 448000 (78%)

Texel Rate

The Radeon Pro Duo is much (more or less 111%) faster with regards to anisotropic filtering than the Radeon HD 7990. (explain)

Radeon Pro Duo 512000 Mtexels/sec
Radeon HD 7990 243200 Mtexels/sec
Difference: 268800 (111%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon Pro Duo is the winner, and very much so. (explain)

Radeon Pro Duo 128000 Mpixels/sec
Radeon HD 7990 60800 Mpixels/sec
Difference: 67200 (111%)

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 7990

Amazon.com

Check prices at:

Radeon Pro Duo

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 7990 Radeon Pro Duo
Manufacturer AMD AMD
Year April 2013 April 2016
Code Name Malta Fiji XT
Memory 3072 MB (x2) 4096 MB (x2)
Core Speed 950 MHz (x2) 1000 MHz (x2)
Memory Speed 6000 MHz (x2) 500 MHz (x2)
Power (Max TDP) 375 watts 350 watts
Bandwidth 576000 MB/sec 1024000 MB/sec
Texel Rate 243200 Mtexels/sec 512000 Mtexels/sec
Pixel Rate 60800 Mpixels/sec 128000 Mpixels/sec
Unified Shaders 2048 (x2) 4096 (x2)
Texture Mapping Units 128 (x2) 256 (x2)
Render Output Units 32 (x2) 64 (x2)
Bus Type GDDR5 HBM
Bus Width 384-bit (x2) 4096-bit (x2)
Fab Process 28 nm 28 nm
Transistors 4313 million 8900 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.1 DirectX 12.0
OpenGL Version OpenGL 4.3 OpenGL 4.5

Memory Bandwidth: Memory bandwidth is the largest 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 card's bus width by its memory clock speed. If it uses DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant 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 max fill rate.

Display Prices

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Radeon HD 7990

Amazon.com

Check prices at:

Radeon Pro Duo

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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