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

Intro

Compare all that to the GeForce GTX 650 Ti 2GB, which features clock speeds of 928 MHz on the GPU, and 1350 MHz on the 2048 MB of GDDR5 RAM. It features 768 SPUs along with 64 TAUs and 16 Rasterization Operator 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 2GB		110 Watts
	Difference: 70 Watts (175%)

Memory Bandwidth

The GeForce GTX 650 Ti 2GB, in theory, should be quite a bit faster than the GeForce 8400 GS 512MB in general. (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 will be much (approximately 1042%) faster with regards to texture 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

If using high levels of AA is important to you, then the GeForce GTX 650 Ti 2GB is superior to the GeForce 8400 GS 512MB, by a large margin. (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: Bandwidth is the maximum amount of data (in units of MB per second) that can be transferred past the external memory interface in one second. It is calculated by multiplying the interface width by its memory speed. If the card has DDR RAM, the result 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 anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the graphics 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 maximum amount of pixels the video card could possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.