GeForce 8400 GS 512MB vs GeForce GTX 650 Ti

Intro

Compare those specs to the GeForce GTX 650 Ti, which has GPU clock speed of 928 MHz, and 1024 MB of GDDR5 memory running at 1350 MHz through a 128-bit bus. It also is made up of 768 SPUs, 64 Texture Address Units, and 16 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 650 Ti		110 Watts
	Difference: 70 Watts (175%)

Memory Bandwidth

Performance-wise, the GeForce GTX 650 Ti should theoretically be quite a bit superior to the GeForce 8400 GS 512MB overall. (explain)

GeForce GTX 650 Ti		86400 MB/sec
GeForce 8400 GS 512MB		6400 MB/sec
	Difference: 80000 (1250%)

Texel Rate

The GeForce GTX 650 Ti is a lot (more or less 1042%) more effective at anisotropic filtering than the GeForce 8400 GS 512MB. (explain)

GeForce GTX 650 Ti		59392 Mtexels/sec
GeForce 8400 GS 512MB		5200 Mtexels/sec
	Difference: 54192 (1042%)

Pixel Rate

The GeForce GTX 650 Ti should be quite a bit (about 471%) faster with regards to full screen anti-aliasing than the GeForce 8400 GS 512MB, and also capable of handling higher screen resolutions while still performing well. (explain)

GeForce GTX 650 Ti		14848 Mpixels/sec
GeForce 8400 GS 512MB		2600 Mpixels/sec
	Difference: 12248 (471%)

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 (measured in megabytes per second) that can be transported across the external memory interface within a second. The number is worked out by multiplying the card's interface width by its memory speed. If it uses DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster 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 texture map elements (texels) that can be processed per second. This figure is calculated by multiplying the total texture units by the core speed of the chip. The higher the texel rate, the better the graphics 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 in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.