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Radeon HD 6670 (OEM) vs Radeon HD 6870

Intro

The Radeon HD 6670 (OEM) uses a 40 nm design. AMD has set the core frequency at 800 MHz. The GDDR5 memory works at a speed of 1000 MHz on this model. It features 480 SPUs along with 24 Texture Address Units and 8 ROPs.

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

Display Graphs

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(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6670 (OEM) 63 Watts
Radeon HD 6870 151 Watts
Difference: 88 Watts (140%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6870 is 110% quicker than the Radeon HD 6670 (OEM) in general, because of its higher bandwidth. (explain)

Radeon HD 6870 134400 MB/sec
Radeon HD 6670 (OEM) 64000 MB/sec
Difference: 70400 (110%)

Texel Rate

The Radeon HD 6870 will be quite a bit (approximately 163%) more effective at texture filtering than the Radeon HD 6670 (OEM). (explain)

Radeon HD 6870 50400 Mtexels/sec
Radeon HD 6670 (OEM) 19200 Mtexels/sec
Difference: 31200 (163%)

Pixel Rate

The Radeon HD 6870 is a lot (more or less 350%) better at AA than the Radeon HD 6670 (OEM), and also should be able to handle higher screen resolutions more effectively. (explain)

Radeon HD 6870 28800 Mpixels/sec
Radeon HD 6670 (OEM) 6400 Mpixels/sec
Difference: 22400 (350%)

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 6670 (OEM)

Amazon.com

Radeon HD 6870

Amazon.com

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 6670 (OEM) Radeon HD 6870
Manufacturer AMD AMD
Year February 2011 October 2010
Code Name Turks Barts XT
Fab Process 40 nm 40 nm
Bus PCIe 2.1 x16 PCIe x16
Memory 512 MB 1024 MB
Core Speed 800 MHz 900 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 4000 MHz 4200 MHz
Unified Shaders 480 1120
Texture Mapping Units 24 56
Render Output Units 8 32
Bus Type GDDR5 GDDR5
Bus Width 128-bit 256-bit
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 4.1 OpenGL 4.1
Power (Max TDP) 63 watts 151 watts
Shader Model 5.0 5.0
Bandwidth 64000 MB/sec 134400 MB/sec
Texel Rate 19200 Mtexels/sec 50400 Mtexels/sec
Pixel Rate 6400 Mpixels/sec 28800 Mpixels/sec

Memory Bandwidth: Bandwidth is the max amount of data (measured in megabytes per second) that can be transferred across the external memory interface within a second. The number is worked out by multiplying the card's interface width by its memory clock speed. In the case of DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This 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 video 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 video card could possibly record to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

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