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Radeon HD 6990 vs Radeon R9 295X2

Intro

The Radeon HD 6990 has a clock frequency of 830 MHz and a GDDR5 memory frequency of 1250 MHz. It also makes use of a 256-bit memory bus, and makes use of a 40 nm design. It is made up of 1536 SPUs, 96 Texture Address Units, and 32 Raster Operation Units.

Compare all that to the Radeon R9 295X2, which comes with core clock speeds of 1018 MHz on the GPU, and 1250 MHz on the 4096 MB of GDDR5 RAM. It features 2816 SPUs along with 176 Texture Address Units 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 R9 295X2 21205 points
Radeon HD 6990 5820 points
Difference: 15385 (264%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6990 375 Watts
Radeon R9 295X2 500 Watts
Difference: 125 Watts (33%)

Memory Bandwidth

The Radeon R9 295X2 should in theory perform a lot faster than the Radeon HD 6990 overall. (explain)

Radeon R9 295X2 640000 MB/sec
Radeon HD 6990 320000 MB/sec
Difference: 320000 (100%)

Texel Rate

The Radeon R9 295X2 is quite a bit (more or less 125%) more effective at anisotropic filtering than the Radeon HD 6990. (explain)

Radeon R9 295X2 358336 Mtexels/sec
Radeon HD 6990 159360 Mtexels/sec
Difference: 198976 (125%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon R9 295X2 is superior to the Radeon HD 6990, by a large margin. (explain)

Radeon R9 295X2 130304 Mpixels/sec
Radeon HD 6990 53120 Mpixels/sec
Difference: 77184 (145%)

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 295X2

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 295X2
Manufacturer AMD AMD
Year March 2011 April 2014
Code Name Antilles Vesuvius
Memory 2048 MB (x2) 4096 MB (x2)
Core Speed 830 MHz (x2) 1018 MHz (x2)
Memory Speed 5000 MHz (x2) 5000 MHz (x2)
Power (Max TDP) 375 watts 500 watts
Bandwidth 320000 MB/sec 640000 MB/sec
Texel Rate 159360 Mtexels/sec 358336 Mtexels/sec
Pixel Rate 53120 Mpixels/sec 130304 Mpixels/sec
Unified Shaders 1536 (x2) 2816 (x2)
Texture Mapping Units 96 (x2) 176 (x2)
Render Output Units 32 (x2) 64 (x2)
Bus Type GDDR5 GDDR5
Bus Width 256-bit (x2) 512-bit (x2)
Fab Process 40 nm 28 nm
Transistors 2640 million 6200 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: Bandwidth is the max amount of information (counted in megabytes per second) that can be transferred over the external memory interface within a second. The number is worked out by multiplying the interface width by its memory clock speed. If it uses DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better 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 processed in one second. This figure is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the clock 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 lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

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Radeon HD 6990

Amazon.com

Check prices at:

Radeon R9 295X2

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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