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Radeon HD 6790 vs Radeon R9 M290X

Intro

The Radeon HD 6790 makes use of a 40 nm design. AMD has set the core frequency at 840 MHz. The GDDR5 RAM is set to run at a speed of 1050 MHz on this card. It features 800 SPUs along with 40 TAUs and 16 Rasterization Operator Units.

Compare all that to the Radeon R9 M290X, which features a core clock frequency of 850 MHz and a GDDR5 memory frequency of 1200 MHz. It also uses a 256-bit memory bus, and uses a 28 nm design. It is made up of 1280 SPUs, 80 TAUs, and 32 Raster Operation Units.

Display Graphs

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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

In theory, the Radeon R9 M290X should perform a bit faster than 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 will be quite a bit (more or less 102%) better at anisotropic 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 will be quite a bit (about 102%) faster with regards to full screen anti-aliasing than the Radeon HD 6790, and also should 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: Bandwidth is the max amount of data (measured in megabytes per second) that can be moved across the external memory interface in a second. It's worked out by multiplying the bus width by the speed of its memory. If it uses DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). 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 potential to reach the max 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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