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Radeon HD 6990 vs Radeon R9 M295X

Intro

The Radeon HD 6990 comes with core clock speeds of 830 MHz on the GPU, and 1250 MHz on the 2048 MB of GDDR5 memory. It features 1536 SPUs along with 96 Texture Address Units and 32 ROPs.

Compare all that to the Radeon R9 M295X, which features GPU clock speed of 750 MHz, and 4096 MB of GDDR5 memory set to run at 1375 MHz through a 256-bit bus. It also features 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 M295X 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 better than the Radeon R9 M295X in general. (explain)

Radeon HD 6990 320000 MB/sec
Radeon R9 M295X 176000 MB/sec
Difference: 144000 (82%)

Texel Rate

The Radeon HD 6990 will be quite a bit (approximately 66%) more effective at AF than the Radeon R9 M295X. (explain)

Radeon HD 6990 159360 Mtexels/sec
Radeon R9 M295X 96000 Mtexels/sec
Difference: 63360 (66%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 6990 is a better choice, by a large margin. (explain)

Radeon HD 6990 53120 Mpixels/sec
Radeon R9 M295X 24000 Mpixels/sec
Difference: 29120 (121%)

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 M295X

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 M295X
Manufacturer AMD AMD
Year March 2011 2014
Code Name Antilles Unknown
Memory 2048 MB (x2) 4096 MB
Core Speed 830 MHz (x2) 750 MHz
Memory Speed 5000 MHz (x2) 5500 MHz
Power (Max TDP) 375 watts 125 watts
Bandwidth 320000 MB/sec 176000 MB/sec
Texel Rate 159360 Mtexels/sec 96000 Mtexels/sec
Pixel Rate 53120 Mpixels/sec 24000 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 11.2
OpenGL Version OpenGL 4.1 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the largest amount of data (counted in megabytes per second) that can be moved past the external memory interface in one second. The number is calculated by multiplying the card's bus width by the speed of its memory. In the case of DDR type RAM, it should be multiplied by 2 once again. If 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 higher screen 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 number of 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 in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

Hide Prices

Radeon HD 6990

Amazon.com

Check prices at:

Radeon R9 M295X

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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