Radeon HD 4850 1GB vs Radeon HD 5770

Intro

The Radeon HD 4850 1GB makes use of a 55 nm design. ATi has clocked the core speed at 625 MHz. The GDDR4 RAM runs at a speed of 993 MHz on this particular model. It features 800(160x5) SPUs along with 40 TAUs and 16 Rasterization Operator Units.

Compare all of that to the Radeon HD 5770, which uses a 40 nm design. ATi has clocked the core speed at 850 MHz. The GDDR5 RAM runs at a frequency of 1200 MHz on this specific card. It features 800(160x5) SPUs along with 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 4850 1GB Amazon.com Other US-based stores Amazon.co.uk Amazon.de Amazon.fr

Radeon HD 5770 Amazon.com Other US-based stores Amazon.co.uk Amazon.de Amazon.fr

Specifications

Model	Radeon HD 4850 1GB	Radeon HD 5770
Manufacturer	ATi	ATi
Year	Jun 25, 2008	October 13, 2009
Code Name	RV770 PRO	Juniper XT
Fab Process	55 nm	40 nm
Bus	PCIe 2.0 x16	PCIe 2.1 x16
Memory	1024 MB	1024 MB
Core Speed	625 MHz	850 MHz
Shader Speed	N/A MHz	(N/A) MHz
Memory Speed	993 MHz	1200 MHz
Unified Shaders	800(160x5)	800(160x5)
Texture Mapping Units	40	40
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)	110 watts	108 watts
Shader Model	4.1	5.0
Bandwidth	63552 MB/sec	76800 MB/sec
Texel Rate	25000 Mtexels/sec	34000 Mtexels/sec
Pixel Rate	10000 Mpixels/sec	13600 Mpixels/sec

Memory Bandwidth: Bandwidth is the maximum amount of information (counted in MB per second) that can be transferred across the external memory interface in a second. The number is worked out by multiplying the interface width by its memory speed. In the case of DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. 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 are processed per 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 the texel rate, the better the graphics card will be at 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 that the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.