Radeon HD 4730 vs Radeon HD 6770

Intro

The Radeon HD 4730 comes with a clock frequency of 700 MHz and a GDDR5 memory frequency of 900 MHz. It also makes use of a 128-bit memory bus, and uses a 55 nm design. It is made up of 640(128x5) SPUs, 32 TAUs, and 8 ROPs.

Compare those specs to the Radeon HD 6770, which makes use of a 40 nm design. ATi has set the core speed at 900 MHz. The GDDR5 memory runs at a speed of 1050 MHz on this particular model. 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 4730 Amazon.com Other US-based stores Amazon.co.uk Amazon.de Amazon.fr

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

Specifications

Model	Radeon HD 4730	Radeon HD 6770
Manufacturer	ATi	ATi
Year	Jun 8, 2009	January 2011
Code Name	RV770/CE	Juniper XT
Fab Process	55 nm	40 nm
Bus	PCIe 2.0 x16	PCIe x16
Memory	512 MB	512 MB
Core Speed	700 MHz	900 MHz
Shader Speed	N/A MHz	(N/A) MHz
Memory Speed	900 MHz	1050 MHz
Unified Shaders	640(128x5)	800
Texture Mapping Units	32	40
Render Output Units	8	16
Bus Type	GDDR5	GDDR5
Bus Width	128-bit	128-bit
DirectX Version	DirectX 10.1	DirectX 11
OpenGL Version	OpenGL 3.0	OpenGL 4.1
Power (Max TDP)	140 watts	108 watts
Shader Model	4.1	5.0
Bandwidth	57600 MB/sec	67200 MB/sec
Texel Rate	22400 Mtexels/sec	36000 Mtexels/sec
Pixel Rate	5600 Mpixels/sec	14400 Mpixels/sec

Memory Bandwidth: Bandwidth is the largest amount of data (measured in megabytes per second) that can be moved over the external memory interface in a second. It is 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 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This figure is calculated by multiplying the total texture units by the core clock speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.