GeForce 9400 GT 256MB vs GeForce GTX 660 Ti

Intro

Compare all that to the GeForce GTX 660 Ti, which has a GPU core clock speed of 915 MHz, and 2048 MB of GDDR5 memory running at 1500 MHz through a 192-bit bus. It also features 1344 Stream Processors, 112 Texture Address Units, and 24 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 9400 GT 256MB		50 Watts
GeForce GTX 660 Ti		150 Watts
	Difference: 100 Watts (200%)

Memory Bandwidth

In theory, the GeForce GTX 660 Ti should be 1025% faster than the GeForce 9400 GT 256MB in general, because of its greater data rate. (explain)

GeForce GTX 660 Ti		144000 MB/sec
GeForce 9400 GT 256MB		12800 MB/sec
	Difference: 131200 (1025%)

Texel Rate

The GeForce GTX 660 Ti is a lot (about 2229%) better at AF than the GeForce 9400 GT 256MB. (explain)

GeForce GTX 660 Ti		102480 Mtexels/sec
GeForce 9400 GT 256MB		4400 Mtexels/sec
	Difference: 98080 (2229%)

Pixel Rate

The GeForce GTX 660 Ti is a lot (more or less 898%) more effective at AA than the GeForce 9400 GT 256MB, and also will be able to handle higher screen resolutions while still performing well. (explain)

GeForce GTX 660 Ti		21960 Mpixels/sec
GeForce 9400 GT 256MB		2200 Mpixels/sec
	Difference: 19760 (898%)

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 data (counted in MB per second) that can be transported across the external memory interface in a second. It's worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster 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 texture map elements (texels) that can be processed per second. This number is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The higher the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.