GeForce 8400 GS 512MB vs GeForce GTX 780 Ti

Intro

Compare all that to the GeForce GTX 780 Ti, which comes with clock speeds of 875 MHz on the GPU, and 1750 MHz on the 3072 MB of GDDR5 memory. It features 2880 SPUs along with 240 Texture Address Units and 48 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8400 GS 512MB		40 Watts
GeForce GTX 780 Ti		250 Watts
	Difference: 210 Watts (525%)

Memory Bandwidth

The GeForce GTX 780 Ti, in theory, should perform a lot faster than the GeForce 8400 GS 512MB in general. (explain)

GeForce GTX 780 Ti		336000 MB/sec
GeForce 8400 GS 512MB		6400 MB/sec
	Difference: 329600 (5150%)

Texel Rate

The GeForce GTX 780 Ti should be a lot (more or less 3938%) faster with regards to texture filtering than the GeForce 8400 GS 512MB. (explain)

GeForce GTX 780 Ti		210000 Mtexels/sec
GeForce 8400 GS 512MB		5200 Mtexels/sec
	Difference: 204800 (3938%)

Pixel Rate

The GeForce GTX 780 Ti should be much (more or less 1515%) better at anti-aliasing than the GeForce 8400 GS 512MB, and also will be able to handle higher resolutions without losing too much performance. (explain)

GeForce GTX 780 Ti		42000 Mpixels/sec
GeForce 8400 GS 512MB		2600 Mpixels/sec
	Difference: 39400 (1515%)

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 moved across the external memory interface within a second. It is worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better 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 number of texture map elements (texels) that are applied per second. This number is worked out by multiplying the total number 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 processed per second.

Pixel Rate: Pixel rate is the most pixels the video 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 Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.