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Radeon HD 6870 vs Radeon HD 7790


The Radeon HD 6870 features a GPU core clock speed of 900 MHz, and the 1024 MB of GDDR5 memory runs at 1050 MHz through a 256-bit bus. It also is comprised of 1120 Stream Processors, 56 TAUs, and 32 ROPs.

Compare all of that to the Radeon HD 7790, which has GPU clock speed of 1000 MHz, and 1024 MB of GDDR5 RAM running at 1500 MHz through a 128-bit bus. It also is comprised of 896 SPUs, 56 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7790 85 Watts
Radeon HD 6870 151 Watts
Difference: 66 Watts (78%)

Memory Bandwidth

Performance-wise, the Radeon HD 6870 should theoretically be much superior to the Radeon HD 7790 overall. (explain)

Radeon HD 6870 134400 MB/sec
Radeon HD 7790 96000 MB/sec
Difference: 38400 (40%)

Texel Rate

The Radeon HD 7790 will be a little bit (approximately 11%) more effective at texture filtering than the Radeon HD 6870. (explain)

Radeon HD 7790 56000 Mtexels/sec
Radeon HD 6870 50400 Mtexels/sec
Difference: 5600 (11%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 6870 is superior to the Radeon HD 7790, by a large margin. (explain)

Radeon HD 6870 28800 Mpixels/sec
Radeon HD 7790 16000 Mpixels/sec
Difference: 12800 (80%)

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 6870

Radeon HD 7790

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 6870 Radeon HD 7790
Manufacturer AMD AMD
Year October 2010 March 2013
Code Name Barts XT Bonaire XT
Memory 1024 MB 1024 MB
Core Speed 900 MHz 1000 MHz
Memory Speed 4200 MHz 6000 MHz
Power (Max TDP) 151 watts 85 watts
Bandwidth 134400 MB/sec 96000 MB/sec
Texel Rate 50400 Mtexels/sec 56000 Mtexels/sec
Pixel Rate 28800 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 1120 896
Texture Mapping Units 56 56
Render Output Units 32 16
Bus Type GDDR5 GDDR5
Bus Width 256-bit 128-bit
Fab Process 40 nm 28 nm
Transistors 1700 million 2080 million
Bus PCIe 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 max amount of data (in units of MB per second) that can be transferred across the external memory interface in one second. The number is calculated by multiplying the bus width by its memory clock speed. In the case of DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The better 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 maximum amount of pixels the video card can possibly write to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. 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 max fill rate.


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