Radeon HD 3870 1GB vs Radeon HD 5750 1GB

Intro

The Radeon HD 3870 1GB features a GPU clock speed of 775 MHz, and the 1024 MB of GDDR4 RAM runs at 1125 MHz through a 256-bit bus. It also is comprised of 320(64x5) Stream Processors, 16 TAUs, and 16 Raster Operation Units.

Compare those specifications to the Radeon HD 5750 1GB, which comes with a GPU core clock speed of 700 MHz, and 1024 MB of GDDR5 RAM set to run at 1150 MHz through a 128-bit bus. It also is comprised of 720(144x5) SPUs, 36 Texture Address Units, and 16 Raster Operation 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 5750 1GB Amazon.com Other US-based stores Amazon.co.uk Amazon.de Amazon.fr

Specifications

Model	Radeon HD 3870 1GB	Radeon HD 5750 1GB
Manufacturer	ATi	ATi
Year	Nov 19, 2007	October 13, 2009
Code Name	RV670 XT	Juniper LE
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	700 MHz
Shader Speed	N/A MHz	(N/A) MHz
Memory Speed	1125 MHz	1150 MHz
Unified Shaders	320(64x5)	720(144x5)
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 3.2
Power (Max TDP)	106 watts	86 watts
Shader Model	4.1	5.0
Bandwidth	72000 MB/sec	73600 MB/sec
Texel Rate	12400 Mtexels/sec	25200 Mtexels/sec
Pixel Rate	12400 Mpixels/sec	11200 Mpixels/sec

Memory Bandwidth: Bandwidth is the maximum amount of data (counted in MB per second) that can be moved across the external memory interface in a second. It's calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR type 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 anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per 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 per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated 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 drawing the pixels (image) on the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.