GeForce 9800 GTX+ vs GeForce GTX 660 Ti

Intro

Compare all that to the GeForce GTX 660 Ti, which features GPU clock speed of 915 MHz, and 2048 MB of GDDR5 RAM set to run at 1500 MHz through a 192-bit bus. It also is made up of 1344 SPUs, 112 Texture Address Units, and 24 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 9800 GTX+		145 Watts
GeForce GTX 660 Ti		150 Watts
	Difference: 5 Watts (3%)

Memory Bandwidth

In theory, the GeForce GTX 660 Ti is 105% faster than the GeForce 9800 GTX+ overall, due to its greater data rate. (explain)

GeForce GTX 660 Ti		144000 MB/sec
GeForce 9800 GTX+		70400 MB/sec
	Difference: 73600 (105%)

Texel Rate

The GeForce GTX 660 Ti is much (more or less 117%) more effective at AF than the GeForce 9800 GTX+. (explain)

GeForce GTX 660 Ti		102480 Mtexels/sec
GeForce 9800 GTX+		47232 Mtexels/sec
	Difference: 55248 (117%)

Pixel Rate

The GeForce GTX 660 Ti is much (more or less 86%) better at AA than the GeForce 9800 GTX+, and also should be able to handle higher screen resolutions without slowing down too much. (explain)

GeForce GTX 660 Ti		21960 Mpixels/sec
GeForce 9800 GTX+		11808 Mpixels/sec
	Difference: 10152 (86%)

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 (counted in megabytes per second) that can be transported over the external memory interface within a second. It's calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

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