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Radeon HD 6790 vs Radeon HD 7770

Intro

The Radeon HD 6790 makes use of a 40 nm design. AMD has set the core frequency at 840 MHz. The GDDR5 RAM is set to run at a speed of 1050 MHz on this card. It features 800 SPUs along with 40 TAUs and 16 Rasterization Operator Units.

Compare those specifications to the Radeon HD 7770, which has a GPU core clock speed of 1000 MHz, and 1024 MB of GDDR5 memory running at 1125 MHz through a 128-bit bus. It also is made up of 640 Stream Processors, 40 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7770 80 Watts
Radeon HD 6790 150 Watts
Difference: 70 Watts (88%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6790 should perform much faster than the Radeon HD 7770 overall. (explain)

Radeon HD 6790 134400 MB/sec
Radeon HD 7770 72000 MB/sec
Difference: 62400 (87%)

Texel Rate

The Radeon HD 7770 should be a bit (more or less 19%) faster with regards to anisotropic filtering than the Radeon HD 6790. (explain)

Radeon HD 7770 40000 Mtexels/sec
Radeon HD 6790 33600 Mtexels/sec
Difference: 6400 (19%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 7770 is a better choice, not by a very large margin though. (explain)

Radeon HD 7770 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 7770

Specifications

Display Specifications

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Model Radeon HD 6790 Radeon HD 7770
Manufacturer AMD AMD
Year April 2011 February 2012
Code Name Barts LE Cape Verde XT
Memory 1024 MB 1024 MB
Core Speed 840 MHz 1000 MHz
Memory Speed 4200 MHz 4500 MHz
Power (Max TDP) 150 watts 80 watts
Bandwidth 134400 MB/sec 72000 MB/sec
Texel Rate 33600 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 13440 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 800 640
Texture Mapping Units 40 40
Render Output Units 16 16
Bus Type GDDR5 GDDR5
Bus Width 256-bit 128-bit
Fab Process 40 nm 28 nm
Transistors 1700 million 1500 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 one second. It is worked out by multiplying the interface width by the speed of its memory. If the card has DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, 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 number of texture map elements (texels) that are processed in one second. This number is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The better the texel rate, the better the graphics card will be at 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 graphics card can possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs 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 output rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Radeon HD 6790

Radeon HD 7770

Comments

3 Responses to “Radeon HD 6790 vs Radeon HD 7770”
D4rkSp4wn says:

I love my HD6790

Alex says:

HD6790 really rocks!!!
I'm able to run everything and almost at max settings.

Сашка-43 says:

Radeon hd 6790 рулит)!!)

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