GeForce 9800 GTX vs GeForce GTX 660 Ti

Intro

Compare those specifications to the GeForce GTX 660 Ti, which makes use of a 28 nm design. nVidia has set the core speed at 915 MHz. The GDDR5 RAM works at a frequency of 1500 MHz on this model. It features 1344 SPUs along with 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		140 Watts
GeForce GTX 660 Ti		150 Watts
	Difference: 10 Watts (7%)

Memory Bandwidth

Performance-wise, the GeForce GTX 660 Ti should theoretically be quite a bit better than the GeForce 9800 GTX overall. (explain)

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

Texel Rate

The GeForce GTX 660 Ti will be quite a bit (about 137%) faster with regards to texture filtering than the GeForce 9800 GTX. (explain)

GeForce GTX 660 Ti		102480 Mtexels/sec
GeForce 9800 GTX		43200 Mtexels/sec
	Difference: 59280 (137%)

Pixel Rate

If running with high levels of AA is important to you, then the GeForce GTX 660 Ti is superior to the GeForce 9800 GTX, and very much so. (explain)

GeForce GTX 660 Ti		21960 Mpixels/sec
GeForce 9800 GTX		10800 Mpixels/sec
	Difference: 11160 (103%)

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 max amount of information (measured in MB per second) that can be moved past the external memory interface in a second. It is worked out by multiplying the card's interface width by its memory speed. If the card has DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, 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 number of texture map elements (texels) that can be applied per second. This is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the the core 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 fill rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.