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Radeon HD 5670 vs Radeon HD 6770 1GB

Intro

The Radeon HD 5670 comes with core clock speeds of 775 MHz on the GPU, and 1000 MHz on the 1024 MB of GDDR5 memory. It features 400(80x5) SPUs as well as 20 Texture Address Units and 8 Rasterization Operator Units.

Compare those specifications to the Radeon HD 6770 1GB, which comes with a core clock speed of 900 MHz and a GDDR5 memory frequency of 1050 MHz. It also features a 128-bit memory bus, and makes use of a 40 nm design. It features 800 SPUs, 40 Texture Address Units, 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 1GB 108 Watts
Difference: 47 Watts (77%)

Memory Bandwidth

In theory, the Radeon HD 6770 1GB is 5% faster than the Radeon HD 5670 in general, because of its greater data rate. (explain)

Radeon HD 6770 1GB 67200 MB/sec
Radeon HD 5670 64000 MB/sec
Difference: 3200 (5%)

Texel Rate

The Radeon HD 6770 1GB should be quite a bit (about 132%) faster with regards to anisotropic filtering than the Radeon HD 5670. (explain)

Radeon HD 6770 1GB 36000 Mtexels/sec
Radeon HD 5670 15500 Mtexels/sec
Difference: 20500 (132%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 6770 1GB is the winner, by a large margin. (explain)

Radeon HD 6770 1GB 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

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Radeon HD 6770 1GB

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 1GB
Manufacturer AMD AMD
Year January 14, 2010 January 2011
Code Name Redwood XT Juniper XT
Memory 1024 MB 1024 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: Memory bandwidth is the maximum amount of data (measured in MB per second) that can be transferred over the external memory interface in one second. The number is calculated by multiplying the card's interface width by its memory speed. If it uses DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The better the texel rate, the better the card will be at 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 write to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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Radeon HD 5670

Amazon.com

Check prices at:

Radeon HD 6770 1GB

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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