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Radeon HD 6790 vs Radeon HD 7790

Intro

The Radeon HD 6790 features a clock speed of 840 MHz and a GDDR5 memory frequency of 1050 MHz. It also features a 256-bit memory bus, and uses a 40 nm design. It features 800 SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Compare all of that to the Radeon HD 7790, which comes with a clock speed of 1000 MHz and a GDDR5 memory speed of 1500 MHz. It also makes use of a 128-bit memory bus, and uses a 28 nm design. It is made up of 896 SPUs, 56 TAUs, and 16 Raster Operation Units.

(No game benchmarks for this combination yet.)

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

As far as performance goes, the Radeon HD 6790 should in theory be quite a bit better than the Radeon HD 7790 in general. (explain)

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

Texel Rate

The Radeon HD 7790 should be quite a bit (more or less 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

The Radeon HD 7790 should be a little bit (approximately 19%) better at AA than the Radeon HD 6790, and also should be able to handle higher resolutions better. (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

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

Model Radeon HD 6790 Radeon HD 7790
Manufacturer AMD AMD
Year April 2011 March 2013
Code Name Barts LE Bonaire XT
Fab Process 40 nm 28 nm
Bus PCIe 2.1 x16 PCIe 3.0 x16
Memory 1024 MB 1024 MB
Core Speed 840 MHz 1000 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 1050 MHz (4200 MHz effective) 1500 MHz (6000 MHz effective)
Unified Shaders 800 896
Texture Mapping Units 40 56
Render Output Units 16 16
Bus Type GDDR5 GDDR5
Bus Width 256-bit 128-bit
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 4.1 OpenGL 4.3
Power (Max TDP) 150 watts 85 watts
Shader Model 5.0 5.0
Bandwidth 134400 MB/sec 96000 MB/sec
Texel Rate 33600 Mtexels/sec 56000 Mtexels/sec
Pixel Rate 13440 Mpixels/sec 16000 Mpixels/sec

Memory Bandwidth: Bandwidth is the largest amount of information (counted in megabytes per second) that can be moved past the external memory interface in a second. It is worked out by multiplying the interface width by its memory clock speed. If it uses DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes 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 memory bandwidth is, the lower the potential to reach the maximum fill rate.

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