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Radeon HD 6670 (OEM) vs Radeon HD 6870

Intro

The Radeon HD 6670 (OEM) comes with a GPU core clock speed of 800 MHz, and the 512 MB of GDDR5 RAM runs at 1000 MHz through a 128-bit bus. It also features 480 Stream Processors, 24 TAUs, and 8 Raster Operation Units.

Compare all of that to the Radeon HD 6870, which has core clock speeds of 900 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 RAM. It features 1120 SPUs along with 56 TAUs and 32 Rasterization Operator Units.

(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

In theory, the Radeon HD 6870 should perform quite a bit faster than the Radeon HD 6670 (OEM) overall. (explain)

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

Texel Rate

The Radeon HD 6870 is quite a bit (more or less 163%) better at anisotropic 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

If using lots of anti-aliasing is important to you, then the Radeon HD 6870 is the winner, by far. (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

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

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 1000 MHz (4000 MHz effective) 1050 MHz (4200 MHz effective)
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: Memory bandwidth is the max amount of data (counted in MB per second) that can be transferred past the external memory interface in a second. The number is worked out by multiplying the card's interface width by the speed of its memory. If the card has DDR RAM, it should be multiplied by 2 once 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, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the graphics 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 most pixels that the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

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