GeForce GT 340 vs Radeon HD 4870 X2

Intro

Compare all of that to the Radeon HD 4870 X2, which makes use of a 55 nm design. AMD has set the core speed at 750 MHz. The GDDR5 memory runs at a frequency of 900 MHz on this model. It features 800(160x5) SPUs along with 40 Texture Address Units 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 4870 X2		350 Watts
	Difference: 281 Watts (407%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4870 X2 should perform a lot faster than the GeForce GT 340 overall. (explain)

Radeon HD 4870 X2		230400 MB/sec
GeForce GT 340		54400 MB/sec
	Difference: 176000 (324%)

Texel Rate

The Radeon HD 4870 X2 should be much (more or less 241%) faster with regards to anisotropic filtering than the GeForce GT 340. (explain)

Radeon HD 4870 X2		60000 Mtexels/sec
GeForce GT 340		17600 Mtexels/sec
	Difference: 42400 (241%)

Pixel Rate

The Radeon HD 4870 X2 is quite a bit (approximately 445%) faster with regards to AA than the GeForce GT 340, and also able to handle higher resolutions more effectively. (explain)

Radeon HD 4870 X2		24000 Mpixels/sec
GeForce GT 340		4400 Mpixels/sec
	Difference: 19600 (445%)

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 moved over the external memory interface in one second. It's calculated by multiplying the bus width by the speed of its memory. If it uses DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This number is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The higher this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

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