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Radeon HD 6790 vs Radeon HD 7950


The Radeon HD 6790 makes use of a 40 nm design. AMD has clocked the core frequency at 840 MHz. The GDDR5 RAM runs at a frequency of 1050 MHz on this particular card. It features 800 SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.

Compare those specs to the Radeon HD 7950, which has GPU clock speed of 800 MHz, and 1536 MB of GDDR5 RAM running at 1250 MHz through a 384-bit bus. It also is comprised of 1792 Stream Processors, 112 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6790 150 Watts
Radeon HD 7950 200 Watts
Difference: 50 Watts (33%)

Memory Bandwidth

In theory, the Radeon HD 7950 should perform much faster than the Radeon HD 6790 in general. (explain)

Radeon HD 7950 240000 MB/sec
Radeon HD 6790 134400 MB/sec
Difference: 105600 (79%)

Texel Rate

The Radeon HD 7950 will be much (more or less 167%) more effective at AF than the Radeon HD 6790. (explain)

Radeon HD 7950 89600 Mtexels/sec
Radeon HD 6790 33600 Mtexels/sec
Difference: 56000 (167%)

Pixel Rate

The Radeon HD 7950 will be much (more or less 90%) more effective at FSAA than the Radeon HD 6790, and also capable of handling higher resolutions without losing too much performance. (explain)

Radeon HD 7950 25600 Mpixels/sec
Radeon HD 6790 13440 Mpixels/sec
Difference: 12160 (90%)

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

Radeon HD 7950

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.


Display Specifications

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Model Radeon HD 6790 Radeon HD 7950
Manufacturer AMD AMD
Year April 2011 January 2012
Code Name Barts LE Tahiti Pro
Memory 1024 MB 1536 MB
Core Speed 840 MHz 800 MHz
Memory Speed 4200 MHz 5000 MHz
Power (Max TDP) 150 watts 200 watts
Bandwidth 134400 MB/sec 240000 MB/sec
Texel Rate 33600 Mtexels/sec 89600 Mtexels/sec
Pixel Rate 13440 Mpixels/sec 25600 Mpixels/sec
Unified Shaders 800 1792
Texture Mapping Units 40 112
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 384-bit
Fab Process 40 nm 28 nm
Transistors 1700 million 4313 million
Bus PCIe 2.1 x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 4.1 OpenGL 4.2

Memory Bandwidth: Memory bandwidth is the largest amount of data (in units of megabytes per second) that can be transported over the external memory interface in a second. It is worked out by multiplying the card's interface width by its memory clock speed. In the case of DDR RAM, 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, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.


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