Radeon HD 3870 1GB vs Radeon HD 6770 1GB

Intro

The Radeon HD 3870 1GB uses a 55 nm design. ATi has set the core speed at 775 MHz. The GDDR4 memory is set to run at a frequency of 1125 MHz on this particular card. It features 320(64x5) SPUs as well as 16 TAUs and 16 ROPs.

Compare those specs to the Radeon HD 6770 1GB, which has core clock speeds of 900 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 memory. It features 800 SPUs as well as 40 TAUs and 16 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 3870 1GB Amazon.com Other US-based stores Amazon.co.uk Amazon.de Amazon.fr

Radeon HD 6770 1GB Amazon.com Other US-based stores Amazon.co.uk Amazon.de Amazon.fr

Specifications

Model	Radeon HD 3870 1GB	Radeon HD 6770 1GB
Manufacturer	ATi	ATi
Year	Nov 19, 2007	January 2011
Code Name	RV670 XT	Juniper XT
Fab Process	55 nm	40 nm
Bus	PCIe 2.0 x16/AGP 8x	PCIe x16
Memory	1024 MB	1024 MB
Core Speed	775 MHz	900 MHz
Shader Speed	N/A MHz	(N/A) MHz
Memory Speed	1125 MHz	1050 MHz
Unified Shaders	320(64x5)	800
Texture Mapping Units	16	40
Render Output Units	16	16
Bus Type	GDDR4	GDDR5
Bus Width	256-bit	128-bit
DirectX Version	DirectX 10.1	DirectX 11
OpenGL Version	OpenGL 3.0	OpenGL 4.1
Power (Max TDP)	106 watts	108 watts
Shader Model	4.1	5.0
Bandwidth	72000 MB/sec	67200 MB/sec
Texel Rate	12400 Mtexels/sec	36000 Mtexels/sec
Pixel Rate	12400 Mpixels/sec	14400 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the maximum amount of information (measured in megabytes per second) that can be moved over the external memory interface in one second. It is worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This number is worked out by multiplying the total number of texture units by the core 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 processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.