GeForce 8400 GS 512MB vs GeForce GTX 660

Intro

Compare those specifications to the GeForce GTX 660, which features GPU core speed of 980 MHz, and 2048 MB of GDDR5 RAM running at 1502 MHz through a 192-bit bus. It also features 960 Stream Processors, 80 TAUs, and 24 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8400 GS 512MB		40 Watts
GeForce GTX 660		140 Watts
	Difference: 100 Watts (250%)

Memory Bandwidth

The GeForce GTX 660, in theory, should be much faster than the GeForce 8400 GS 512MB in general. (explain)

GeForce GTX 660		144192 MB/sec
GeForce 8400 GS 512MB		6400 MB/sec
	Difference: 137792 (2153%)

Texel Rate

The GeForce GTX 660 should be much (more or less 1408%) better at AF than the GeForce 8400 GS 512MB. (explain)

GeForce GTX 660		78400 Mtexels/sec
GeForce 8400 GS 512MB		5200 Mtexels/sec
	Difference: 73200 (1408%)

Pixel Rate

The GeForce GTX 660 is quite a bit (about 805%) better at FSAA than the GeForce 8400 GS 512MB, and also capable of handling higher resolutions better. (explain)

GeForce GTX 660		23520 Mpixels/sec
GeForce 8400 GS 512MB		2600 Mpixels/sec
	Difference: 20920 (805%)

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 (measured in MB per second) that can be transported over the external memory interface in one second. It's worked out by multiplying the card's interface width by its memory clock speed. If it uses DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, 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 are applied per second. This figure is worked out by multiplying the total amount of texture units by the core speed of the chip. The higher the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.