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Radeon HD 6790 vs Radeon HD 7790

Intro

The Radeon HD 6790 uses a 40 nm design. AMD has set the core speed at 840 MHz. The GDDR5 memory works at a speed of 1050 MHz on this card. It features 800 SPUs along with 40 TAUs and 16 Rasterization Operator Units.

Compare those specifications to the Radeon HD 7790, which features clock speeds of 1000 MHz on the GPU, and 1500 MHz on the 1024 MB of GDDR5 memory. It features 896 SPUs as well as 56 TAUs and 16 ROPs.

Display Graphs

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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

The Radeon HD 6790 should in theory be quite a bit faster than the Radeon HD 7790 overall. (explain)

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

Texel Rate

The Radeon HD 7790 should be much (more or less 67%) more effective at anisotropic filtering than the Radeon HD 6790. (explain)

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

Pixel Rate

The Radeon HD 7790 will be a bit (approximately 19%) faster with regards to AA than the Radeon HD 6790, and should be able to handle higher screen resolutions without losing too much performance. (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: Bandwidth is the maximum amount of information (measured in MB per second) that can be moved past the external memory interface in a second. It is calculated by multiplying the bus width by its memory clock speed. In the case of DDR type memory, the result should be multiplied by 2 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, 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 number is calculated by multiplying the total number of texture units by the core clock speed of the chip. The higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

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