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

Intro

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

Display Graphs

Hide Graphs

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

Theoretically, the Geforce GTX 780 should be a lot faster than the GeForce 8800 GTS (G80) 640MB in general. (explain)

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

Texel Rate

The Geforce GTX 780 should be a lot (about 573%) more effective at anisotropic filtering 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

If using high levels of AA is important to you, then the Geforce GTX 780 is the winner, by a large margin. (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 maximum amount of data (measured in MB per second) that can be moved past the external memory interface in one second. The number is worked out by multiplying the card's bus width by its memory speed. If it uses DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's 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 can be processed per second. This figure is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

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