GeForce 8400 GS 512MB vs GeForce GTX 560

Intro

Compare all of that to the GeForce GTX 560, which comes with a GPU core clock speed of 810 MHz, and 1024 MB of GDDR5 RAM set to run at 1001 MHz through a 256-bit bus. It also features 336 Stream Processors, 56 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8400 GS 512MB		40 Watts
GeForce GTX 560		150 Watts
	Difference: 110 Watts (275%)

Memory Bandwidth

In theory, the GeForce GTX 560 should be 1902% quicker than the GeForce 8400 GS 512MB overall, due to its greater bandwidth. (explain)

GeForce GTX 560		128128 MB/sec
GeForce 8400 GS 512MB		6400 MB/sec
	Difference: 121728 (1902%)

Texel Rate

The GeForce GTX 560 should be much (more or less 772%) faster with regards to AF than the GeForce 8400 GS 512MB. (explain)

GeForce GTX 560		45360 Mtexels/sec
GeForce 8400 GS 512MB		5200 Mtexels/sec
	Difference: 40160 (772%)

Pixel Rate

The GeForce GTX 560 should be a lot (more or less 897%) more effective at full screen anti-aliasing than the GeForce 8400 GS 512MB, and also should be able to handle higher screen resolutions without slowing down too much. (explain)

GeForce GTX 560		25920 Mpixels/sec
GeForce 8400 GS 512MB		2600 Mpixels/sec
	Difference: 23320 (897%)

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: Memory bandwidth is the largest amount of information (counted in megabytes per second) that can be transferred past the external memory interface in a second. It's worked out by multiplying the interface width by its memory speed. If the card has DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This is worked out 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 card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the the card's 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 output rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.