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Radeon HD 6990 vs Radeon R9 M390X

Intro

The Radeon HD 6990 uses a 40 nm design. AMD has set the core speed at 830 MHz. The GDDR5 memory runs at a speed of 1250 MHz on this model. It features 1536 SPUs as well as 96 Texture Address Units and 32 Rasterization Operator Units.

Compare all that to the Radeon R9 M390X, which features a GPU core clock speed of 723 MHz, and 4096 MB of GDDR5 RAM set to run at 1250 MHz through a 256-bit bus. It also is comprised of 2048 SPUs, 128 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M390X 125 Watts
Radeon HD 6990 375 Watts
Difference: 250 Watts (200%)

Memory Bandwidth

As far as performance goes, the Radeon HD 6990 should theoretically be much superior to the Radeon R9 M390X overall. (explain)

Radeon HD 6990 320000 MB/sec
Radeon R9 M390X 160000 MB/sec
Difference: 160000 (100%)

Texel Rate

The Radeon HD 6990 is a lot (approximately 72%) more effective at AF than the Radeon R9 M390X. (explain)

Radeon HD 6990 159360 Mtexels/sec
Radeon R9 M390X 92544 Mtexels/sec
Difference: 66816 (72%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 6990 is superior to the Radeon R9 M390X, by far. (explain)

Radeon HD 6990 53120 Mpixels/sec
Radeon R9 M390X 23136 Mpixels/sec
Difference: 29984 (130%)

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 R9 M390X

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 R9 M390X
Manufacturer AMD AMD
Year March 2011 2015
Code Name Antilles Tonga
Memory 2048 MB (x2) 4096 MB
Core Speed 830 MHz (x2) 723 MHz
Memory Speed 5000 MHz (x2) 5000 MHz
Power (Max TDP) 375 watts 125 watts
Bandwidth 320000 MB/sec 160000 MB/sec
Texel Rate 159360 Mtexels/sec 92544 Mtexels/sec
Pixel Rate 53120 Mpixels/sec 23136 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) 256-bit
Fab Process 40 nm 28 nm
Transistors 2640 million (Unknown) million
Bus PCIe 2.1 x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 12
OpenGL Version OpenGL 4.1 OpenGL 4.3

Memory Bandwidth: Bandwidth is the largest amount of information (in units of megabytes per second) that can be moved past the external memory interface in one second. It is calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied per second. This is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The higher 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 number of pixels the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 6990

Amazon.com

Check prices at:

Radeon R9 M390X

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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