GeForce 8800 GTS (G80) 640MB vs Geforce GTX 670

Intro

Compare those specifications to the Geforce GTX 670, which comes with GPU core speed of 915 MHz, and 2048 MB of GDDR5 memory running at 1500 MHz through a 256-bit bus. It also is made up of 1344 Stream Processors, 112 TAUs, and 32 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 670		170 Watts
	Difference: 27 Watts (19%)

Memory Bandwidth

The Geforce GTX 670 should theoretically perform a lot faster than the GeForce 8800 GTS (G80) 640MB in general. (explain)

Geforce GTX 670		192000 MB/sec
GeForce 8800 GTS (G80) 640MB		63360 MB/sec
	Difference: 128640 (203%)

Texel Rate

The Geforce GTX 670 is a lot (more or less 316%) better at texture filtering than the GeForce 8800 GTS (G80) 640MB. (explain)

Geforce GTX 670		102480 Mtexels/sec
GeForce 8800 GTS (G80) 640MB		24624 Mtexels/sec
	Difference: 77856 (316%)

Pixel Rate

The Geforce GTX 670 will be quite a bit (about 185%) better at AA than the GeForce 8800 GTS (G80) 640MB, and will be able to handle higher resolutions better. (explain)

Geforce GTX 670		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 largest amount of data (in units of MB per second) that can be transported over the external memory interface in a second. The number is worked out by multiplying the card's bus width by its memory speed. If the card has DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied per second. This figure is worked out 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 graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.