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Radeon HD 6790 vs Radeon HD 7950


Intro

The Radeon HD 6790 comes with a GPU clock speed of 840 MHz, and the 1024 MB of GDDR5 RAM runs at 1050 MHz through a 256-bit bus. It also features 800 Stream Processors, 40 Texture Address Units, and 16 ROPs.

Compare those specs to the Radeon HD 7950, which has core speeds of 800 MHz on the GPU, and 1250 MHz on the 1536 MB of GDDR5 memory. It features 1792 SPUs along with 112 Texture Address Units and 32 ROPs.

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Radeon HD 7950 7731 points
Radeon HD 6790 2150 points
Difference: 5581 (260%)

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

Performance-wise, the Radeon HD 7950 should theoretically be quite a bit better 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 is quite a bit (approximately 167%) faster with regards to anisotropic filtering than the Radeon HD 6790. (explain)

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

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 7950 is the winner, and very much so. (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

Amazon.com

Radeon HD 7950

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 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 maximum amount of information (in units of MB per second) that can be transferred over the external memory interface in a second. It is worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This figure is calculated by multiplying the total amount of texture units by the core 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 processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. 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 memory bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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Radeon HD 6790

Amazon.com

Radeon HD 7950

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.

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