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Radeon HD 6790 vs Radeon R9 M290X

Intro

The Radeon HD 6790 features a core clock frequency of 840 MHz and a GDDR5 memory speed of 1050 MHz. It also uses a 256-bit bus, and makes use of a 40 nm design. It is made up of 800 SPUs, 40 TAUs, and 16 ROPs.

Compare that to the Radeon R9 M290X, which makes use of a 28 nm design. AMD has clocked the core speed at 850 MHz. The GDDR5 RAM runs at a frequency of 1200 MHz on this particular card. It features 1280 SPUs as well as 80 TAUs and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M290X 100 Watts
Radeon HD 6790 150 Watts
Difference: 50 Watts (50%)

Memory Bandwidth

As far as performance goes, the Radeon R9 M290X should theoretically be a small bit superior to the Radeon HD 6790 in general. (explain)

Radeon R9 M290X 153600 MB/sec
Radeon HD 6790 134400 MB/sec
Difference: 19200 (14%)

Texel Rate

The Radeon R9 M290X is much (about 102%) better at texture filtering than the Radeon HD 6790. (explain)

Radeon R9 M290X 68000 Mtexels/sec
Radeon HD 6790 33600 Mtexels/sec
Difference: 34400 (102%)

Pixel Rate

The Radeon R9 M290X should be much (more or less 102%) more effective at AA than the Radeon HD 6790, and will be capable of handling higher resolutions without losing too much performance. (explain)

Radeon R9 M290X 27200 Mpixels/sec
Radeon HD 6790 13440 Mpixels/sec
Difference: 13760 (102%)

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.

Price Comparison

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Radeon HD 6790

Amazon.com

Check prices at:

Radeon R9 M290X

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 6790 Radeon R9 M290X
Manufacturer AMD AMD
Year April 2011 May 1 2014
Code Name Barts LE Neptune XT
Memory 1024 MB 4096 MB
Core Speed 840 MHz 850 MHz
Memory Speed 4200 MHz 4800 MHz
Power (Max TDP) 150 watts 100 watts
Bandwidth 134400 MB/sec 153600 MB/sec
Texel Rate 33600 Mtexels/sec 68000 Mtexels/sec
Pixel Rate 13440 Mpixels/sec 27200 Mpixels/sec
Unified Shaders 800 1280
Texture Mapping Units 40 80
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 40 nm 28 nm
Transistors 1700 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 max amount of information (measured in megabytes per second) that can be moved past the external memory interface in one second. The number is worked out by multiplying the card's interface width by its memory speed. If it uses DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This number is calculated by multiplying the total texture units 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 processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount 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 output rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 6790

Amazon.com

Check prices at:

Radeon R9 M290X

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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