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

Intro

Compare those specifications to the GeForce GTX 780 Ti, which has GPU core speed of 875 MHz, and 3072 MB of GDDR5 RAM set to run at 1750 MHz through a 384-bit bus. It also is made up of 2880 Stream Processors, 240 TAUs, and 48 Raster Operation Units.

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 Ti		250 Watts
	Difference: 107 Watts (75%)

Memory Bandwidth

The GeForce GTX 780 Ti, in theory, should be much faster than the GeForce 8800 GTS (G80) 640MB in general. (explain)

GeForce GTX 780 Ti		336000 MB/sec
GeForce 8800 GTS (G80) 640MB		63360 MB/sec
	Difference: 272640 (430%)

Texel Rate

The GeForce GTX 780 Ti should be much (about 753%) more effective at texture filtering than the GeForce 8800 GTS (G80) 640MB. (explain)

GeForce GTX 780 Ti		210000 Mtexels/sec
GeForce 8800 GTS (G80) 640MB		24624 Mtexels/sec
	Difference: 185376 (753%)

Pixel Rate

The GeForce GTX 780 Ti will be much (more or less 309%) faster with regards to anti-aliasing than the GeForce 8800 GTS (G80) 640MB, and should be able to handle higher resolutions better. (explain)

GeForce GTX 780 Ti		42000 Mpixels/sec
GeForce 8800 GTS (G80) 640MB		10260 Mpixels/sec
	Difference: 31740 (309%)

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 maximum amount of information (counted in MB per second) that can be transported past the external memory interface within a second. It's worked out by multiplying the interface width by its memory speed. If the card has DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.