GeForce 8800 GTS (G80) 640MB vs GeForce GTX 580

Intro

Compare all that to the GeForce GTX 580, which has GPU clock speed of 772 MHz, and 1536 MB of GDDR5 memory running at 1002 MHz through a 384-bit bus. It also is comprised of 512 Stream Processors, 64 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 580		244 Watts
	Difference: 101 Watts (71%)

Memory Bandwidth

The GeForce GTX 580 should theoretically be quite a bit faster than the GeForce 8800 GTS (G80) 640MB overall. (explain)

GeForce GTX 580		192384 MB/sec
GeForce 8800 GTS (G80) 640MB		63360 MB/sec
	Difference: 129024 (204%)

Texel Rate

The GeForce GTX 580 should be quite a bit (more or less 101%) more effective at AF than the GeForce 8800 GTS (G80) 640MB. (explain)

GeForce GTX 580		49408 Mtexels/sec
GeForce 8800 GTS (G80) 640MB		24624 Mtexels/sec
	Difference: 24784 (101%)

Pixel Rate

If using a high screen resolution is important to you, then the GeForce GTX 580 is superior to the GeForce 8800 GTS (G80) 640MB, and very much so. (explain)

GeForce GTX 580		37056 Mpixels/sec
GeForce 8800 GTS (G80) 640MB		10260 Mpixels/sec
	Difference: 26796 (261%)

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 data (counted in megabytes per second) that can be moved across the external memory interface in a second. It is worked out by multiplying the interface width by its memory speed. If the card has DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied per second. This figure is calculated by multiplying the total amount of texture units of the card 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 a second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the the card's clock speed. 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 rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.