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Radeon HD 6790 vs Radeon HD 7790

Intro

The Radeon HD 6790 makes use of a 40 nm design. AMD has set the core frequency at 840 MHz. The GDDR5 memory runs at a speed of 1050 MHz on this particular model. It features 800 SPUs as well as 40 TAUs and 16 ROPs.

Compare all that to the Radeon HD 7790, which uses a 28 nm design. AMD has clocked the core speed at 1000 MHz. The GDDR5 RAM is set to run at a speed of 1500 MHz on this card. It features 896 SPUs along with 56 TAUs and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7790 85 Watts
Radeon HD 6790 150 Watts
Difference: 65 Watts (76%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6790 will be 40% quicker than the Radeon HD 7790 in general, due to its greater data rate. (explain)

Radeon HD 6790 134400 MB/sec
Radeon HD 7790 96000 MB/sec
Difference: 38400 (40%)

Texel Rate

The Radeon HD 7790 is much (about 67%) better at texture filtering than the Radeon HD 6790. (explain)

Radeon HD 7790 56000 Mtexels/sec
Radeon HD 6790 33600 Mtexels/sec
Difference: 22400 (67%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 7790 is superior to the Radeon HD 6790, not by a very large margin though. (explain)

Radeon HD 7790 16000 Mpixels/sec
Radeon HD 6790 13440 Mpixels/sec
Difference: 2560 (19%)

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

Radeon HD 7790

Amazon.com

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 HD 7790
Manufacturer AMD AMD
Year April 2011 March 2013
Code Name Barts LE Bonaire XT
Memory 1024 MB 1024 MB
Core Speed 840 MHz 1000 MHz
Memory Speed 4200 MHz 6000 MHz
Power (Max TDP) 150 watts 85 watts
Bandwidth 134400 MB/sec 96000 MB/sec
Texel Rate 33600 Mtexels/sec 56000 Mtexels/sec
Pixel Rate 13440 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 800 896
Texture Mapping Units 40 56
Render Output Units 16 16
Bus Type GDDR5 GDDR5
Bus Width 256-bit 128-bit
Fab Process 40 nm 28 nm
Transistors 1700 million 2080 million
Bus PCIe 2.1 x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 4.1 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the largest amount of data (in units of megabytes per second) that can be moved over the external memory interface within a second. The number is calculated by multiplying the card's bus width by its memory speed. If it uses DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total texture units of the card by the core speed of the chip. The higher this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the the core 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, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

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