GeForce 8400 GS 512MB vs GeForce GTX 660 Ti

Intro

Compare all of that to the GeForce GTX 660 Ti, which has GPU clock speed of 915 MHz, and 2048 MB of GDDR5 memory set to run at 1500 MHz through a 192-bit bus. It also is comprised 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 8400 GS 512MB		40 Watts
GeForce GTX 660 Ti		150 Watts
	Difference: 110 Watts (275%)

Memory Bandwidth

In theory, the GeForce GTX 660 Ti should be 2150% quicker than the GeForce 8400 GS 512MB in general, due to its greater data rate. (explain)

GeForce GTX 660 Ti		144000 MB/sec
GeForce 8400 GS 512MB		6400 MB/sec
	Difference: 137600 (2150%)

Texel Rate

The GeForce GTX 660 Ti should be quite a bit (about 1871%) faster with regards to anisotropic filtering than the GeForce 8400 GS 512MB. (explain)

GeForce GTX 660 Ti		102480 Mtexels/sec
GeForce 8400 GS 512MB		5200 Mtexels/sec
	Difference: 97280 (1871%)

Pixel Rate

The GeForce GTX 660 Ti is quite a bit (approximately 745%) better at FSAA than the GeForce 8400 GS 512MB, and also will be capable of handling higher screen resolutions more effectively. (explain)

GeForce GTX 660 Ti		21960 Mpixels/sec
GeForce 8400 GS 512MB		2600 Mpixels/sec
	Difference: 19360 (745%)

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 maximum amount of data (in units of MB per second) that can be transferred across the external memory interface in one second. It is worked out by multiplying the bus width by its memory speed. In the case of DDR type memory, the result should be multiplied by 2 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 AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed 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 better the texel rate, the better the video 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 a second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.