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 is made up of 480 Stream Processors, 24 Texture Address Units, and 8 Raster Operation Units.

Compare those specifications to the Radeon HD 6870, which uses a 40 nm design. ATi has clocked the core speed at 900 MHz. The GDDR5 memory runs at a frequency of 1050 MHz on this card. It features 1120 SPUs along with 56 Texture Address Units and 32 Rasterization Operator Units.

Price Comparison

Please note that the price comparisons are based on search keywords, and might not be the exact same card listed on this page. We have no control over the accuracy of their search results.

Radeon HD 6670 (OEM) Amazon.com Other US-based stores Amazon.co.uk Amazon.de Amazon.fr

Radeon HD 6870 Amazon.com Other US-based stores Amazon.co.uk Amazon.de Amazon.fr

Specifications

Model	Radeon HD 6670 (OEM)	Radeon HD 6870
Manufacturer	ATi	ATi
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: Bandwidth is the max amount of data (measured in MB per second) that can be moved past the external memory interface in one second. It's calculated by multiplying the interface width by the speed of its memory. In the case of DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs 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 also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.