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Radeon HD 5670 vs Radeon HD 6770

Intro

The Radeon HD 5670 comes with a GPU clock speed of 775 MHz, and the 1024 MB of GDDR5 RAM is set to run at 1000 MHz through a 128-bit bus. It also features 400(80x5) SPUs, 20 TAUs, and 8 Raster Operation Units.

Compare those specs to the Radeon HD 6770, which features a clock frequency of 900 MHz and a GDDR5 memory frequency of 1050 MHz. It also features a 128-bit bus, and makes use of a 40 nm design. It is comprised of 800 SPUs, 40 TAUs, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5670 61 Watts
Radeon HD 6770 108 Watts
Difference: 47 Watts (77%)

Memory Bandwidth

Performance-wise, the Radeon HD 6770 should in theory be just a bit superior to the Radeon HD 5670 in general. (explain)

Radeon HD 6770 67200 MB/sec
Radeon HD 5670 64000 MB/sec
Difference: 3200 (5%)

Texel Rate

The Radeon HD 6770 will be much (more or less 132%) more effective at AF than the Radeon HD 5670. (explain)

Radeon HD 6770 36000 Mtexels/sec
Radeon HD 5670 15500 Mtexels/sec
Difference: 20500 (132%)

Pixel Rate

The Radeon HD 6770 should be a lot (more or less 132%) more effective at AA than the Radeon HD 5670, and also capable of handling higher resolutions without slowing down too much. (explain)

Radeon HD 6770 14400 Mpixels/sec
Radeon HD 5670 6200 Mpixels/sec
Difference: 8200 (132%)

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 5670

Amazon.com

Check prices at:

Radeon HD 6770

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 5670 Radeon HD 6770
Manufacturer AMD AMD
Year January 14, 2010 January 2011
Code Name Redwood XT Juniper XT
Memory 1024 MB 512 MB
Core Speed 775 MHz 900 MHz
Memory Speed 4000 MHz 4200 MHz
Power (Max TDP) 61 watts 108 watts
Bandwidth 64000 MB/sec 67200 MB/sec
Texel Rate 15500 Mtexels/sec 36000 Mtexels/sec
Pixel Rate 6200 Mpixels/sec 14400 Mpixels/sec
Unified Shaders 400(80x5) 800
Texture Mapping Units 20 40
Render Output Units 8 16
Bus Type GDDR5 GDDR5
Bus Width 128-bit 128-bit
Fab Process 40 nm 40 nm
Transistors 627 million 1040 million
Bus PCIe 2.1 x16 PCIe x16
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 3.2 OpenGL 4.1

Memory Bandwidth: Bandwidth is the max amount of information (in units of MB per second) that can be transferred past the external memory interface in one second. It's worked out by multiplying the bus width by its memory speed. In the case of DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better 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 applied per second. This figure is calculated by multiplying the total number 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 applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

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Radeon HD 5670

Amazon.com

Check prices at:

Radeon HD 6770

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.

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