GeForce 9800 GX2 vs GeForce GTX 660 Ti

Intro

Compare those specs to the GeForce GTX 660 Ti, which has GPU core speed of 915 MHz, and 2048 MB of GDDR5 RAM running at 1500 MHz through a 192-bit bus. It also is made up of 1344 Stream Processors, 112 Texture Address Units, and 24 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 660 Ti		150 Watts
GeForce 9800 GX2		197 Watts
	Difference: 47 Watts (31%)

Memory Bandwidth

The GeForce GTX 660 Ti, in theory, should perform a bit faster than the GeForce 9800 GX2 overall. (explain)

GeForce GTX 660 Ti		144000 MB/sec
GeForce 9800 GX2		128000 MB/sec
	Difference: 16000 (13%)

Texel Rate

The GeForce GTX 660 Ti should be a lot (more or less 33%) faster with regards to anisotropic filtering than the GeForce 9800 GX2. (explain)

GeForce GTX 660 Ti		102480 Mtexels/sec
GeForce 9800 GX2		76800 Mtexels/sec
	Difference: 25680 (33%)

Pixel Rate

The GeForce GTX 660 Ti is just a bit (about 14%) more effective at full screen anti-aliasing than the GeForce 9800 GX2, and should be able to handle higher screen resolutions more effectively. (explain)

GeForce GTX 660 Ti		21960 Mpixels/sec
GeForce 9800 GX2		19200 Mpixels/sec
	Difference: 2760 (14%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Bandwidth is the max amount of data (measured in MB per second) that can be moved across the external memory interface in one second. It is calculated by multiplying the interface width by its memory speed. If it uses DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to the local memory in one 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 - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.