GeForce GT 340 vs Geforce GTX 680

Intro

Compare that to the Geforce GTX 680, which has GPU core speed of 1006 MHz, and 2048 MB of GDDR5 RAM running at 1502 MHz through a 256-bit bus. It also is made up of 1536 SPUs, 128 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 340		69 Watts
Geforce GTX 680		195 Watts
	Difference: 126 Watts (183%)

Memory Bandwidth

In theory, the Geforce GTX 680 should perform much faster than the GeForce GT 340 overall. (explain)

Geforce GTX 680		192256 MB/sec
GeForce GT 340		54400 MB/sec
	Difference: 137856 (253%)

Texel Rate

The Geforce GTX 680 should be quite a bit (about 632%) faster with regards to texture filtering than the GeForce GT 340. (explain)

Geforce GTX 680		128768 Mtexels/sec
GeForce GT 340		17600 Mtexels/sec
	Difference: 111168 (632%)

Pixel Rate

The Geforce GTX 680 should be a lot (approximately 632%) more effective at full screen anti-aliasing than the GeForce GT 340, and also will be capable of handling higher screen resolutions better. (explain)

Geforce GTX 680		32192 Mpixels/sec
GeForce GT 340		4400 Mpixels/sec
	Difference: 27792 (632%)

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.

Price Comparison

Specifications

Memory Bandwidth: Bandwidth is the max amount of information (measured in megabytes per second) that can be moved over the external memory interface in one second. It's calculated by multiplying the interface width by its memory clock speed. In the case of DDR memory, it should be multiplied by 2 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 anti-aliasing, High Dynamic Range and high 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 number of texture units of the card by the core clock speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

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