Radeon HD 3870 1GB vs Radeon HD 6750

Intro

The Radeon HD 3870 1GB uses a 55 nm design. ATi has set the core speed at 775 MHz. The GDDR4 memory works at a frequency of 1125 MHz on this specific model. It features 320(64x5) SPUs along with 16 Texture Address Units and 16 Rasterization Operator Units.

Compare those specs to the Radeon HD 6750, which has a clock speed of 725 MHz and a GDDR5 memory frequency of 1000 MHz. It also makes use of a 128-bit memory bus, and uses a 40 nm design. It features 720 SPUs, 36 TAUs, and 16 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 6750 Amazon.com Other US-based stores Amazon.co.uk Amazon.de Amazon.fr

Specifications

Model	Radeon HD 3870 1GB	Radeon HD 6750
Manufacturer	ATi	ATi
Year	Nov 19, 2007	January 2011
Code Name	RV670 XT	Juniper Pro
Fab Process	55 nm	40 nm
Bus	PCIe 2.0 x16/AGP 8x	PCIe x16
Memory	1024 MB	512 MB
Core Speed	775 MHz	725 MHz
Shader Speed	N/A MHz	(N/A) MHz
Memory Speed	1125 MHz	1000 MHz
Unified Shaders	320(64x5)	720
Texture Mapping Units	16	36
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 4.0
Power (Max TDP)	106 watts	86 watts
Shader Model	4.1	5.0
Bandwidth	72000 MB/sec	64000 MB/sec
Texel Rate	12400 Mtexels/sec	26100 Mtexels/sec
Pixel Rate	12400 Mpixels/sec	11600 Mpixels/sec

Memory Bandwidth: Bandwidth is the max amount of data (counted in MB per second) that can be transferred across the external memory interface within a second. The number is worked out by multiplying the interface width by its memory clock speed. If it uses DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better 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 amount of texture map elements (texels) that can be processed in one second. This figure is worked out by multiplying the total texture units 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 processed in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the the core clock speed. 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 lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.