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Radeon HD 5670 vs Radeon HD 6870

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 TAUs and 8 Rasterization Operator Units.

Compare that to the Radeon HD 6870, which features GPU core speed of 900 MHz, and 1024 MB of GDDR5 RAM running at 1050 MHz through a 256-bit bus. It also is made up of 1120 SPUs, 56 Texture Address Units, and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5670 61 Watts
Radeon HD 6870 151 Watts
Difference: 90 Watts (148%)

Memory Bandwidth

The Radeon HD 6870 should in theory be quite a bit faster than the Radeon HD 5670 in general. (explain)

Radeon HD 6870 134400 MB/sec
Radeon HD 5670 64000 MB/sec
Difference: 70400 (110%)

Texel Rate

The Radeon HD 6870 should be much (about 225%) better at texture filtering than the Radeon HD 5670. (explain)

Radeon HD 6870 50400 Mtexels/sec
Radeon HD 5670 15500 Mtexels/sec
Difference: 34900 (225%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 6870 is a better choice, by a large margin. (explain)

Radeon HD 6870 28800 Mpixels/sec
Radeon HD 5670 6200 Mpixels/sec
Difference: 22600 (365%)

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 6870

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.

Specifications

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Model Radeon HD 5670 Radeon HD 6870
Manufacturer AMD AMD
Year January 14, 2010 October 2010
Code Name Redwood XT Barts XT
Memory 1024 MB 1024 MB
Core Speed 775 MHz 900 MHz
Memory Speed 4000 MHz 4200 MHz
Power (Max TDP) 61 watts 151 watts
Bandwidth 64000 MB/sec 134400 MB/sec
Texel Rate 15500 Mtexels/sec 50400 Mtexels/sec
Pixel Rate 6200 Mpixels/sec 28800 Mpixels/sec
Unified Shaders 400(80x5) 1120
Texture Mapping Units 20 56
Render Output Units 8 32
Bus Type GDDR5 GDDR5
Bus Width 128-bit 256-bit
Fab Process 40 nm 40 nm
Transistors 627 million 1700 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 max amount of information (measured in megabytes per second) that can be transferred over the external memory interface in one second. It is calculated by multiplying the card's interface width by its memory speed. If the card has DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed 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 video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number 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 filling the screen with pixels (the image). The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

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Radeon HD 5670

Amazon.com

Check prices at:

Radeon HD 6870

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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