GeForce 8800 GTS (G80) 640MB vs Geforce GTX 680

Intro

Compare all of that to the Geforce GTX 680, which comes with core 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 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8800 GTS (G80) 640MB		143 Watts
Geforce GTX 680		195 Watts
	Difference: 52 Watts (36%)

Memory Bandwidth

Theoretically speaking, the Geforce GTX 680 should perform much faster than the GeForce 8800 GTS (G80) 640MB in general. (explain)

Geforce GTX 680		192256 MB/sec
GeForce 8800 GTS (G80) 640MB		63360 MB/sec
	Difference: 128896 (203%)

Texel Rate

The Geforce GTX 680 will be a lot (more or less 423%) more effective at texture filtering than the GeForce 8800 GTS (G80) 640MB. (explain)

Geforce GTX 680		128768 Mtexels/sec
GeForce 8800 GTS (G80) 640MB		24624 Mtexels/sec
	Difference: 104144 (423%)

Pixel Rate

The Geforce GTX 680 will be a lot (approximately 214%) faster with regards to FSAA than the GeForce 8800 GTS (G80) 640MB, and also should be able to handle higher resolutions without slowing down too much. (explain)

Geforce GTX 680		32192 Mpixels/sec
GeForce 8800 GTS (G80) 640MB		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 largest amount of information (measured in MB per second) that can be transported over the external memory interface in one second. The number is calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs 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 output rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.