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Radeon HD 6770 1GB vs Radeon HD 6790

Intro

The Radeon HD 6770 1GB features core clock speeds of 900 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 memory. It features 800 SPUs along with 40 TAUs and 16 Rasterization Operator Units.

Compare all of that to the Radeon HD 6790, which has GPU core speed of 840 MHz, and 1024 MB of GDDR5 memory running at 1050 MHz through a 256-bit bus. It also features 800 Stream Processors, 40 TAUs, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770 1GB 108 Watts
Radeon HD 6790 150 Watts
Difference: 42 Watts (39%)

Memory Bandwidth

The Radeon HD 6790 should theoretically be a lot faster than the Radeon HD 6770 1GB in general. (explain)

Radeon HD 6790 134400 MB/sec
Radeon HD 6770 1GB 67200 MB/sec
Difference: 67200 (100%)

Texel Rate

The Radeon HD 6770 1GB is a small bit (more or less 7%) faster with regards to texture filtering than the Radeon HD 6790. (explain)

Radeon HD 6770 1GB 36000 Mtexels/sec
Radeon HD 6790 33600 Mtexels/sec
Difference: 2400 (7%)

Pixel Rate

The Radeon HD 6770 1GB will be a bit (more or less 7%) faster with regards to FSAA than the Radeon HD 6790, and also should be able to handle higher screen resolutions while still performing well. (explain)

Radeon HD 6770 1GB 14400 Mpixels/sec
Radeon HD 6790 13440 Mpixels/sec
Difference: 960 (7%)

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 6770 1GB

Amazon.com

Check prices at:

Radeon HD 6790

Amazon.com

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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 6770 1GB Radeon HD 6790
Manufacturer AMD AMD
Year January 2011 April 2011
Code Name Juniper XT Barts LE
Memory 1024 MB 1024 MB
Core Speed 900 MHz 840 MHz
Memory Speed 4200 MHz 4200 MHz
Power (Max TDP) 108 watts 150 watts
Bandwidth 67200 MB/sec 134400 MB/sec
Texel Rate 36000 Mtexels/sec 33600 Mtexels/sec
Pixel Rate 14400 Mpixels/sec 13440 Mpixels/sec
Unified Shaders 800 800
Texture Mapping Units 40 40
Render Output Units 16 16
Bus Type GDDR5 GDDR5
Bus Width 128-bit 256-bit
Fab Process 40 nm 40 nm
Transistors 1040 million 1700 million
Bus PCIe x16 PCIe 2.1 x16
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 4.1 OpenGL 4.1

Memory Bandwidth: Bandwidth is the max amount of data (measured in megabytes per second) that can be moved over the external memory interface in one second. The number is calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to the 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 clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 6770 1GB

Amazon.com

Check prices at:

Radeon HD 6790

Amazon.com

Check prices at:

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.

Comments

One Response to “Radeon HD 6770 1GB vs Radeon HD 6790”
Anonymous says:

6790 is the best in compare to all in 7500 rs

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