Radeon HD 4850 X2 512MB vs Radeon HD 6750

Intro

The Radeon HD 4850 X2 512MB uses a 55 nm design. ATi has set the core frequency at 625 MHz. The GDDR3 memory runs at a frequency of 993 MHz on this particular card. It features 800(160x5) SPUs as well as 40 TAUs and 16 ROPs.

Compare those specifications to the Radeon HD 6750, which comes with clock speeds of 725 MHz on the GPU, and 1000 MHz on the 512 MB of GDDR5 RAM. It features 720 SPUs along with 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 4850 X2 512MB 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 4850 X2 512MB	Radeon HD 6750
Manufacturer	ATi	ATi
Year	Nov 7, 2008	January 2011
Code Name	R700	Juniper Pro
Fab Process	55 nm	40 nm
Bus	PCIe 2.0 x16 (PCIe bridge)	PCIe x16
Memory	512 MB (x2)	512 MB
Core Speed	625 MHz (x2)	725 MHz
Shader Speed	N/A MHz (x2)	(N/A) MHz
Memory Speed	993 MHz (x2)	1000 MHz
Unified Shaders	800(160x5) (x2)	720
Texture Mapping Units	40 (x2)	36
Render Output Units	16 (x2)	16
Bus Type	GDDR3	GDDR5
Bus Width	256-bit (x2)	128-bit
DirectX Version	DirectX 10.1	DirectX 11
OpenGL Version	OpenGL 3.0	OpenGL 4.0
Power (Max TDP)	250 watts	86 watts
Shader Model	4.1	5.0
Bandwidth	127104 MB/sec	64000 MB/sec
Texel Rate	50000 Mtexels/sec	26100 Mtexels/sec
Pixel Rate	20000 Mpixels/sec	11600 Mpixels/sec

Memory Bandwidth: Bandwidth is the maximum amount of information (in units of MB per second) that can be transported across the external memory interface in a second. It's worked out by multiplying the bus width by its memory speed. If it uses DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster 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 applied per second. This is calculated by multiplying the total texture units of the card by the core 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 processed in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.