GeForce GT 340 vs Radeon HD 4890 1GB

Intro

The GeForce GT 340 comes with a core clock speed of 550 MHz and a GDDR5 memory speed of 850 MHz. It also features a 128-bit bus, and makes use of a 40 nm design. It is made up of 96 SPUs, 32 Texture Address Units, and 8 Raster Operation Units.

Compare that to the Radeon HD 4890 1GB, which comes with core speeds of 1000 MHz on the GPU, and 975 MHz on the 1024 MB of GDDR5 RAM. It features 800(160x5) SPUs along with 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.

GeForce GT 340 Amazon.com Other US-based stores Amazon.co.uk Amazon.de Amazon.fr

Radeon HD 4890 1GB Amazon.com Other US-based stores Amazon.co.uk Amazon.de Amazon.fr

Specifications

Model	GeForce GT 340	Radeon HD 4890 1GB
Manufacturer	nVidia	ATi
Year	February 2010	Apr 2, 2009
Code Name	GT215	RV790 XT
Fab Process	40 nm	55 nm
Bus	PCIe x16	PCIe 2.0 x16
Memory	512 MB	1024 MB
Core Speed	550 MHz	1000 MHz
Shader Speed	1340 MHz	(N/A) MHz
Memory Speed	850 MHz (3400 MHz effective)	975 MHz (3900 MHz effective)
Unified Shaders	96	800(160x5)
Texture Mapping Units	32	40
Render Output Units	8	16
Bus Type	GDDR5	GDDR5
Bus Width	128-bit	256-bit
DirectX Version	DirectX 10.1	DirectX 10.1
OpenGL Version	OpenGL 3.3	OpenGL 3.0
Power (Max TDP)	69 watts	190 watts
Shader Model	4.1	4.1
Bandwidth	54400 MB/sec	124800 MB/sec
Texel Rate	17600 Mtexels/sec	40000 Mtexels/sec
Pixel Rate	4400 Mpixels/sec	16000 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the max amount of information (measured in megabytes per second) that can be moved over the external memory interface within a second. The number is worked out by multiplying the card's bus width by the speed of its memory. If the card has DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, 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 amount of texture map elements (texels) that can be applied in one second. This figure is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The higher the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.