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

Intro

Compare those specifications to the GeForce GTX 570, which has a core clock speed of 732 MHz and a GDDR5 memory frequency of 950 MHz. It also features a 320-bit memory bus, and makes use of a 40 nm design. It features 480 SPUs, 60 Texture Address Units, and 40 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 570		219 Watts
	Difference: 76 Watts (53%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 570 should theoretically be quite a bit better than the GeForce 8800 GTS (G80) 640MB in general. (explain)

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

Texel Rate

The GeForce GTX 570 will be quite a bit (about 78%) better at AF 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

If running with a high screen resolution is important to you, then the GeForce GTX 570 is a better choice, and very much so. (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: Memory bandwidth is the max amount of data (measured in megabytes per second) that can be transferred over the external memory interface within a second. It's worked out by multiplying the interface width by its memory clock speed. If the card has DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's 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 number of texture map elements (texels) that are processed per second. This number is worked out by multiplying the total texture units by the core clock speed of the chip. The better the texel rate, the better the graphics 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 the video card could possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.