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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 clocked the core speed at 800 MHz. The GDDR5 memory works at a speed of 1000 MHz on this card. It features 480 SPUs as well as 24 Texture Address Units and 8 Rasterization Operator Units.

Compare those specs to the Radeon HD 6870, which makes use of a 40 nm design. AMD has clocked the core frequency at 900 MHz. The GDDR5 RAM works at a speed of 1050 MHz on this specific card. It features 1120 SPUs as well as 56 Texture Address Units and 32 ROPs.

Display Graphs

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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

The Radeon HD 6870 should in theory be a lot 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 (about 163%) faster with regards to 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 quite a bit (more or less 350%) more effective at anti-aliasing than the Radeon HD 6670 (OEM), and will be able to handle higher resolutions without slowing down too much. (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
Memory 512 MB 1024 MB
Core Speed 800 MHz 900 MHz
Memory Speed 4000 MHz 4200 MHz
Power (Max TDP) 63 watts 151 watts
Bandwidth 64000 MB/sec 134400 MB/sec
Texel Rate 19200 Mtexels/sec 50400 Mtexels/sec
Pixel Rate 6400 Mpixels/sec 28800 Mpixels/sec
Unified Shaders 480 1120
Texture Mapping Units 24 56
Render Output Units 8 32
Bus Type GDDR5 GDDR5
Bus Width 128-bit 256-bit
Fab Process 40 nm 40 nm
Transistors 715 million 1700 million
Bus PCIe 2.1 x16 PCIe x16
DirectX Version DirectX 11 DirectX 11
OpenGL Version OpenGL 4.1 OpenGL 4.1

Memory Bandwidth: Bandwidth is the max amount of information (in units of megabytes per second) that can be transferred across the external memory interface in one second. It is worked out by multiplying the bus width by its memory speed. If the card has DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better 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 number of texture map elements (texels) that are processed per second. This number is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the clock speed of the card. 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 output rate is also dependant on many 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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