Radeon HD 3870 1GB vs Radeon HD 5670

Intro

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

Compare those specs to the Radeon HD 5670, which uses a 40 nm design. ATi has set the core frequency at 775 MHz. The GDDR5 memory works at a frequency of 1000 MHz on this model. It features 400(80x5) SPUs along with 20 TAUs and 8 ROPs.

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 5670 Amazon.com Other US-based stores Amazon.co.uk Amazon.de Amazon.fr

Specifications

Model	Radeon HD 3870 1GB	Radeon HD 5670
Manufacturer	ATi	ATi
Year	Nov 19, 2007	January 14, 2010
Code Name	RV670 XT	Redwood XT
Fab Process	55 nm	40 nm
Bus	PCIe 2.0 x16/AGP 8x	PCIe 2.1 x16
Memory	1024 MB	1024 MB
Core Speed	775 MHz	775 MHz
Shader Speed	N/A MHz	(N/A) MHz
Memory Speed	1125 MHz	1000 MHz
Unified Shaders	320(64x5)	400(80x5)
Texture Mapping Units	16	20
Render Output Units	16	8
Bus Type	GDDR4	GDDR5
Bus Width	256-bit	128-bit
DirectX Version	DirectX 10.1	DirectX 11
OpenGL Version	OpenGL 3.0	OpenGL 3.2
Power (Max TDP)	106 watts	61 watts
Shader Model	4.1	5.0
Bandwidth	72000 MB/sec	64000 MB/sec
Texel Rate	12400 Mtexels/sec	15500 Mtexels/sec
Pixel Rate	12400 Mpixels/sec	6200 Mpixels/sec

Memory Bandwidth: Bandwidth is the largest amount of data (in units of megabytes per second) that can be moved past the external memory interface in a second. It is worked out by multiplying the interface width by its memory clock speed. If it uses DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs 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 fill rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.