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Radeon HD 6790 vs Radeon HD 7790


Intro

The Radeon HD 6790 makes use of a 40 nm design. AMD has clocked the core frequency at 840 MHz. The GDDR5 memory runs at a frequency of 1050 MHz on this specific card. It features 800 SPUs along with 40 TAUs and 16 Rasterization Operator Units.

Compare those specifications to the Radeon HD 7790, which comes with a clock frequency of 1000 MHz and a GDDR5 memory frequency of 1500 MHz. It also features a 128-bit bus, and makes use of a 28 nm design. It is comprised of 896 SPUs, 56 Texture Address Units, and 16 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 7790 4330 points
Radeon HD 6790 2150 points
Difference: 2180 (101%)

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

Performance-wise, the Radeon HD 6790 should theoretically be quite a bit superior to 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 is much (approximately 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

If running with high levels of AA is important to you, then the Radeon HD 7790 is the winner, though only just barely. (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

Radeon HD 7790

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 transferred over the external memory interface in one second. It's worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This figure is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The higher 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 that the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

Radeon HD 6790

Radeon HD 7790

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