Radeon HD 4830 512MB vs Radeon HD 4850 512MB

Intro

The Radeon HD 4830 512MB uses a 55 nm design. ATi has set the core speed at 575 MHz. The GDDR3 memory runs at a frequency of 900 MHz on this specific model. It features 640(128x5) SPUs as well as 32 TAUs and 16 Rasterization Operator Units.

Compare all of that to the Radeon HD 4850 512MB, which makes use of a 55 nm design. ATi has set the core speed at 625 MHz. The GDDR3 RAM works at a speed of 993 MHz on this model. It features 800(160x5) SPUs along with 40 Texture Address Units and 16 Rasterization Operator Units.

Price Comparison

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Radeon HD 4830 512MB Amazon.com Other US-based stores Amazon.co.uk Amazon.de Amazon.fr

Radeon HD 4850 512MB Amazon.com Other US-based stores Amazon.co.uk Amazon.de Amazon.fr

Specifications

Model	Radeon HD 4830 512MB	Radeon HD 4850 512MB
Manufacturer	ATi	ATi
Year	Oct 21, 2008	Jun 25, 2008
Code Name	RV770 LE	RV770 PRO
Fab Process	55 nm	55 nm
Bus	PCIe 2.0 x16	PCIe 2.0 x16
Memory	512 MB	512 MB
Core Speed	575 MHz	625 MHz
Shader Speed	N/A MHz	(N/A) MHz
Memory Speed	900 MHz	993 MHz
Unified Shaders	640(128x5)	800(160x5)
Texture Mapping Units	32	40
Render Output Units	16	16
Bus Type	GDDR3	GDDR3
Bus Width	256-bit	256-bit
DirectX Version	DirectX 10.1	DirectX 10.1
OpenGL Version	OpenGL 3.0	OpenGL 3.0
Power (Max TDP)	95 watts	110 watts
Shader Model	4.1	4.1
Bandwidth	57600 MB/sec	63552 MB/sec
Texel Rate	18400 Mtexels/sec	25000 Mtexels/sec
Pixel Rate	9200 Mpixels/sec	10000 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the largest amount of data (in units of MB per second) that can be transported across the external memory interface within a second. The number is calculated by multiplying the card's interface width by its memory speed. In the case of DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, 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 can be applied in one second. This figure is calculated by multiplying the total amount of 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 in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly write to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of 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 fill rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.