GeForce 8800 GTS (G80) 640MB vs GeForce GTX 570

Intro

Compare those specs to the GeForce GTX 570, which comes with clock speeds of 732 MHz on the GPU, and 950 MHz on the 1280 MB of GDDR5 RAM. It features 480 SPUs along with 60 TAUs and 40 Rasterization Operator 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 570		219 Watts
	Difference: 76 Watts (53%)

Memory Bandwidth

In theory, the GeForce GTX 570 should be 140% quicker than the GeForce 8800 GTS (G80) 640MB in general, due to its higher bandwidth. (explain)

GeForce GTX 570		152000 MB/sec
GeForce 8800 GTS (G80) 640MB		63360 MB/sec
	Difference: 88640 (140%)

Texel Rate

The GeForce GTX 570 should be much (about 78%) faster with regards to texture filtering than the GeForce 8800 GTS (G80) 640MB. (explain)

GeForce GTX 570		43920 Mtexels/sec
GeForce 8800 GTS (G80) 640MB		24624 Mtexels/sec
	Difference: 19296 (78%)

Pixel Rate

The GeForce GTX 570 will be much (about 185%) faster with regards to full screen anti-aliasing than the GeForce 8800 GTS (G80) 640MB, and also will be able to handle higher screen resolutions while still performing well. (explain)

GeForce GTX 570		29280 Mpixels/sec
GeForce 8800 GTS (G80) 640MB		10260 Mpixels/sec
	Difference: 19020 (185%)

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 (in units of megabytes per second) that can be transferred across the external memory interface within a second. It is worked out by multiplying the card's interface width by its memory speed. If the card has DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.