GeForce GT 340 1GB vs Geforce GTX 680

Intro

Compare those specs to the Geforce GTX 680, which comes with clock speeds of 1006 MHz on the GPU, and 1502 MHz on the 2048 MB of GDDR5 RAM. It features 1536 SPUs as well as 128 TAUs and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 340 1GB		69 Watts
Geforce GTX 680		195 Watts
	Difference: 126 Watts (183%)

Memory Bandwidth

Performance-wise, the Geforce GTX 680 should theoretically be much superior to the GeForce GT 340 1GB in general. (explain)

Geforce GTX 680		192256 MB/sec
GeForce GT 340 1GB		54400 MB/sec
	Difference: 137856 (253%)

Texel Rate

The Geforce GTX 680 will be much (approximately 632%) faster with regards to AF than the GeForce GT 340 1GB. (explain)

Geforce GTX 680		128768 Mtexels/sec
GeForce GT 340 1GB		17600 Mtexels/sec
	Difference: 111168 (632%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Geforce GTX 680 is the winner, by far. (explain)

Geforce GTX 680		32192 Mpixels/sec
GeForce GT 340 1GB		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 (in units of megabytes per second) that can be transported across the external memory interface within a second. It is worked out by multiplying the card's interface width by its memory clock speed. If it uses DDR RAM, 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, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This number is calculated by multiplying the total number of texture units by the core 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 one second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly record 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 clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.