GeForce 8800 GTS (G80) 640MB vs Geforce GTX 780

Intro

Compare all that to the Geforce GTX 780, which features core clock speeds of 863 MHz on the GPU, and 1502 MHz on the 3072 MB of GDDR5 memory. It features 2304 SPUs along with 192 TAUs and 48 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8800 GTS (G80) 640MB		143 Watts
Geforce GTX 780		250 Watts
	Difference: 107 Watts (75%)

Memory Bandwidth

As far as performance goes, the Geforce GTX 780 should theoretically be much better than the GeForce 8800 GTS (G80) 640MB overall. (explain)

Geforce GTX 780		288384 MB/sec
GeForce 8800 GTS (G80) 640MB		63360 MB/sec
	Difference: 225024 (355%)

Texel Rate

The Geforce GTX 780 is quite a bit (about 573%) better at AF than the GeForce 8800 GTS (G80) 640MB. (explain)

Geforce GTX 780		165696 Mtexels/sec
GeForce 8800 GTS (G80) 640MB		24624 Mtexels/sec
	Difference: 141072 (573%)

Pixel Rate

The Geforce GTX 780 will be quite a bit (about 304%) faster with regards to anti-aliasing than the GeForce 8800 GTS (G80) 640MB, and able to handle higher screen resolutions more effectively. (explain)

Geforce GTX 780		41424 Mpixels/sec
GeForce 8800 GTS (G80) 640MB		10260 Mpixels/sec
	Difference: 31164 (304%)

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: Memory bandwidth is the largest amount of information (measured in megabytes per second) that can be transported across the external memory interface in a second. The number is worked out by multiplying the card's interface width by its memory clock speed. In the case of DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This figure 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 video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to its local memory per second - measured in millions of pixels per second. The number is calculated 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 outputting the pixels (image) to the screen. The actual pixel rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.