Radeon HD 4670 1GB vs Radeon HD 7770

Intro

The Radeon HD 4670 1GB features a core clock frequency of 750 MHz and a GDDR4/GDDR3/DDR3/DDR2 memory speed of 1100 MHz. It also uses a 128-bit bus, and uses a 55 nm design. It features 320(64x5) SPUs, 32 TAUs, and 8 ROPs.

Compare all that to the Radeon HD 7770, which has a GPU core clock speed of 1000 MHz, and 1024 MB of GDDR5 RAM set to run at 1125 MHz through a 128-bit bus. It also is made up of 640 Stream Processors, 40 Texture Address Units, 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 4670 1GB Amazon.com Other US-based stores Amazon.co.uk Amazon.de Amazon.fr

Radeon HD 7770 Amazon.com Other US-based stores Amazon.co.uk Amazon.de Amazon.fr

Specifications

Model	Radeon HD 4670 1GB	Radeon HD 7770
Manufacturer	ATi	ATi
Year	Sep 10, 2008	February 2012
Code Name	RV730 XT	Cape Verde XT
Fab Process	55 nm	28 nm
Bus	PCIe 2.0 x16, AGP 8x	PCIe 3.0 x16
Memory	1024 MB	1024 MB
Core Speed	750 MHz	1000 MHz
Shader Speed	N/A MHz	(N/A) MHz
Memory Speed	1100 MHz (2200 MHz effective)	1125 MHz (4500 MHz effective)
Unified Shaders	320(64x5)	640
Texture Mapping Units	32	40
Render Output Units	8	16
Bus Type	GDDR4/GDDR3/DDR3/DDR2	GDDR5
Bus Width	128-bit	128-bit
DirectX Version	DirectX 10.1	DirectX 11.1
OpenGL Version	OpenGL 3.0	OpenGL 4.2
Power (Max TDP)	70 watts	80 watts
Shader Model	4.1	5.0
Bandwidth	35200 MB/sec	72000 MB/sec
Texel Rate	24000 Mtexels/sec	40000 Mtexels/sec
Pixel Rate	6000 Mpixels/sec	16000 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the maximum amount of information (counted in megabytes per second) that can be transported over the external memory interface within a second. The number is calculated by multiplying the card's bus width by its memory speed. If the card has DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly record to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. 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 fill rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.