GeForce 8800 GTS (G80) 640MB vs GeForce GTX 660 Ti

Intro

Compare that to the GeForce GTX 660 Ti, which comes with core speeds of 915 MHz on the GPU, and 1500 MHz on the 2048 MB of GDDR5 RAM. It features 1344 SPUs as well as 112 Texture Address Units and 24 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 660 Ti		150 Watts
	Difference: 7 Watts (5%)

Memory Bandwidth

Performance-wise, the GeForce GTX 660 Ti should in theory be quite a bit better than the GeForce 8800 GTS (G80) 640MB in general. (explain)

GeForce GTX 660 Ti		144000 MB/sec
GeForce 8800 GTS (G80) 640MB		63360 MB/sec
	Difference: 80640 (127%)

Texel Rate

The GeForce GTX 660 Ti will be quite a bit (approximately 316%) more effective at texture filtering than the GeForce 8800 GTS (G80) 640MB. (explain)

GeForce GTX 660 Ti		102480 Mtexels/sec
GeForce 8800 GTS (G80) 640MB		24624 Mtexels/sec
	Difference: 77856 (316%)

Pixel Rate

The GeForce GTX 660 Ti is a lot (more or less 114%) faster with regards to FSAA than the GeForce 8800 GTS (G80) 640MB, and also will be able to handle higher screen resolutions without losing too much performance. (explain)

GeForce GTX 660 Ti		21960 Mpixels/sec
GeForce 8800 GTS (G80) 640MB		10260 Mpixels/sec
	Difference: 11700 (114%)

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 (in units of megabytes 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 the speed of its memory. If the card has DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This figure is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

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