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Radeon HD 6990 vs Radeon R9 M395X

Intro

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

Compare all of that to the Radeon R9 M395X, which comes with GPU clock speed of 723 MHz, and 4096 MB of GDDR5 memory running at 1250 MHz through a 256-bit bus. It also is comprised of 2048 SPUs, 128 TAUs, 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 should in theory be 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 a lot (more or less 72%) more effective at 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

If running with lots of anti-aliasing is important to you, then the Radeon HD 6990 is a better choice, by far. (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: Bandwidth is the maximum amount of information (counted in MB per second) that can be transported across the external memory interface within a second. It is worked out by multiplying the bus width by the speed of its memory. If the card has DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen 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 texture units of the card by the core clock 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 applied in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum 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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