Radeon HD 4890 2GB vs Radeon HD 5830

Intro

The Radeon HD 4890 2GB comes with a GPU core speed of 1000 MHz, and the 2048 MB of GDDR5 memory runs at 975 MHz through a 256-bit bus. It also is made up of 800(160x5) Stream Processors, 40 Texture Address Units, and 16 ROPs.

Compare all of that to the Radeon HD 5830, which makes use of a 40 nm design. ATi has set the core frequency at 800 MHz. The GDDR5 RAM runs at a speed of 1000 MHz on this model. It features 1120(224x5) SPUs along with 56 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 4890 2GB Amazon.com Other US-based stores Amazon.co.uk Amazon.de Amazon.fr

Radeon HD 5830 Amazon.com Other US-based stores Amazon.co.uk Amazon.de Amazon.fr

Specifications

Model	Radeon HD 4890 2GB	Radeon HD 5830
Manufacturer	ATi	ATi
Year	Apr 2, 2009	February 25, 2010
Code Name	RV790 XT	Cypress LE
Fab Process	55 nm	40 nm
Bus	PCIe 2.0 x16	PCIe 2.1 x16
Memory	2048 MB	1024 MB
Core Speed	1000 MHz	800 MHz
Shader Speed	N/A MHz	(N/A) MHz
Memory Speed	975 MHz	1000 MHz
Unified Shaders	800(160x5)	1120(224x5)
Texture Mapping Units	40	56
Render Output Units	16	16
Bus Type	GDDR5	GDDR5
Bus Width	256-bit	256-bit
DirectX Version	DirectX 10.1	DirectX 11
OpenGL Version	OpenGL 3.0	OpenGL 3.2
Power (Max TDP)	190 watts	175 watts
Shader Model	4.1	5.0
Bandwidth	124800 MB/sec	128000 MB/sec
Texel Rate	40000 Mtexels/sec	44800 Mtexels/sec
Pixel Rate	16000 Mpixels/sec	12800 Mpixels/sec

Memory Bandwidth: Bandwidth is the largest amount of information (in units of megabytes per second) that can be transferred over the external memory interface in one second. It's worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR RAM, the result should 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 AA, 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 number is worked out 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 video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

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