GeForce GT 340 vs Radeon HD 4850 X2 1GB

Intro

Compare those specs to the Radeon HD 4850 X2 1GB, which comes with core clock speeds of 625 MHz on the GPU, and 993 MHz on the 1024 MB of GDDR3 memory. It features 800(160x5) SPUs along with 40 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 340		69 Watts
Radeon HD 4850 X2 1GB		250 Watts
	Difference: 181 Watts (262%)

Memory Bandwidth

The Radeon HD 4850 X2 1GB should theoretically be much faster than the GeForce GT 340 in general. (explain)

Radeon HD 4850 X2 1GB		127104 MB/sec
GeForce GT 340		54400 MB/sec
	Difference: 72704 (134%)

Texel Rate

The Radeon HD 4850 X2 1GB should be much (approximately 184%) better at texture filtering than the GeForce GT 340. (explain)

Radeon HD 4850 X2 1GB		50000 Mtexels/sec
GeForce GT 340		17600 Mtexels/sec
	Difference: 32400 (184%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 4850 X2 1GB is the winner, and very much so. (explain)

Radeon HD 4850 X2 1GB		20000 Mpixels/sec
GeForce GT 340		4400 Mpixels/sec
	Difference: 15600 (355%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Bandwidth is the max amount of data (in units of megabytes per second) that can be transferred over the external memory interface within a second. It is calculated by multiplying the interface width by its memory speed. If it uses DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.