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Radeon HD 6990 vs Radeon R9 M395X

Intro

The Radeon HD 6990 comes with core speeds of 830 MHz on the GPU, and 1250 MHz on the 2048 MB of GDDR5 memory. It features 1536 SPUs as well as 96 TAUs and 32 Rasterization Operator Units.

Compare those specs to the Radeon R9 M395X, which features a GPU core clock speed of 723 MHz, and 4096 MB of GDDR5 RAM running at 1250 MHz through a 256-bit bus. It also is made up of 2048 SPUs, 128 Texture Address Units, and 32 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M395X 125 Watts
Radeon HD 6990 375 Watts
Difference: 250 Watts (200%)

Memory Bandwidth

The Radeon HD 6990, in theory, should perform quite a bit faster than the Radeon R9 M395X in general. (explain)

Radeon HD 6990 320000 MB/sec
Radeon R9 M395X 160000 MB/sec
Difference: 160000 (100%)

Texel Rate

The Radeon HD 6990 will be much (approximately 72%) faster with regards to anisotropic filtering than the Radeon R9 M395X. (explain)

Radeon HD 6990 159360 Mtexels/sec
Radeon R9 M395X 92544 Mtexels/sec
Difference: 66816 (72%)

Pixel Rate

The Radeon HD 6990 will be quite a bit (about 130%) more effective at FSAA than the Radeon R9 M395X, and should be able to handle higher resolutions more effectively. (explain)

Radeon HD 6990 53120 Mpixels/sec
Radeon R9 M395X 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 M395X

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 M395X
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: Memory bandwidth is the max amount of data (in units of megabytes per second) that can be moved over the external memory interface within a second. It is worked out by multiplying the bus width by its memory speed. If it uses DDR memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

Hide Prices

Radeon HD 6990

Amazon.com

Check prices at:

Radeon R9 M395X

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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