GeForce 8400 GS 512MB vs GeForce GTX 650 Ti 2GB

Intro

Compare those specs to the GeForce GTX 650 Ti 2GB, which features a core clock frequency of 928 MHz and a GDDR5 memory speed of 1350 MHz. It also makes use of a 128-bit bus, and makes use of a 28 nm design. It is made up of 768 SPUs, 64 Texture Address Units, and 16 ROPs.

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 2GB		110 Watts
	Difference: 70 Watts (175%)

Memory Bandwidth

In theory, the GeForce GTX 650 Ti 2GB should be much faster than the GeForce 8400 GS 512MB overall. (explain)

GeForce GTX 650 Ti 2GB		86400 MB/sec
GeForce 8400 GS 512MB		6400 MB/sec
	Difference: 80000 (1250%)

Texel Rate

The GeForce GTX 650 Ti 2GB should be quite a bit (approximately 1042%) more effective at anisotropic filtering than the GeForce 8400 GS 512MB. (explain)

GeForce GTX 650 Ti 2GB		59392 Mtexels/sec
GeForce 8400 GS 512MB		5200 Mtexels/sec
	Difference: 54192 (1042%)

Pixel Rate

The GeForce GTX 650 Ti 2GB will be quite a bit (more or less 471%) better at full screen anti-aliasing than the GeForce 8400 GS 512MB, and should be able to handle higher screen resolutions more effectively. (explain)

GeForce GTX 650 Ti 2GB		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 max amount of information (in units of megabytes per second) that can be transported past the external memory interface in one second. It's worked out by multiplying the bus width by its memory clock speed. In the case of DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This figure is calculated by multiplying the total texture units of the card by the core speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.