GeForce 8800 GTS (G80) 320MB vs Geforce GTX 680

Intro

Compare all of that to the Geforce GTX 680, which has clock speeds of 1006 MHz on the GPU, and 1502 MHz on the 2048 MB of GDDR5 memory. It features 1536 SPUs along with 128 TAUs and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8800 GTS (G80) 320MB		143 Watts
Geforce GTX 680		195 Watts
	Difference: 52 Watts (36%)

Memory Bandwidth

In theory, the Geforce GTX 680 should be 203% faster than the GeForce 8800 GTS (G80) 320MB in general, because of its higher bandwidth. (explain)

Geforce GTX 680		192256 MB/sec
GeForce 8800 GTS (G80) 320MB		63360 MB/sec
	Difference: 128896 (203%)

Texel Rate

The Geforce GTX 680 should be a lot (approximately 423%) faster with regards to texture filtering than the GeForce 8800 GTS (G80) 320MB. (explain)

Geforce GTX 680		128768 Mtexels/sec
GeForce 8800 GTS (G80) 320MB		24624 Mtexels/sec
	Difference: 104144 (423%)

Pixel Rate

The Geforce GTX 680 will be much (about 214%) more effective at AA than the GeForce 8800 GTS (G80) 320MB, and will be able to handle higher resolutions without losing too much performance. (explain)

Geforce GTX 680		32192 Mpixels/sec
GeForce 8800 GTS (G80) 320MB		10260 Mpixels/sec
	Difference: 21932 (214%)

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 (counted in megabytes per second) that can be transported past the external memory interface in a second. It's calculated by multiplying the bus width by its memory speed. In the case of DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster 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 are applied per second. This number is worked out by multiplying the total texture units of the card by the core speed of the chip. The better this number, the better the graphics card will be at handling 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 video card can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.