GeForce 8400 GS 512MB vs GeForce GTX 660 Ti

Intro

Compare those specifications to the GeForce GTX 660 Ti, which uses a 28 nm design. nVidia has clocked the core frequency at 915 MHz. The GDDR5 memory works at a speed of 1500 MHz on this card. It features 1344 SPUs along with 112 Texture Address Units and 24 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8400 GS 512MB		40 Watts
GeForce GTX 660 Ti		150 Watts
	Difference: 110 Watts (275%)

Memory Bandwidth

Performance-wise, the GeForce GTX 660 Ti should in theory be much superior to the GeForce 8400 GS 512MB overall. (explain)

GeForce GTX 660 Ti		144000 MB/sec
GeForce 8400 GS 512MB		6400 MB/sec
	Difference: 137600 (2150%)

Texel Rate

The GeForce GTX 660 Ti will be quite a bit (approximately 1871%) more effective at anisotropic filtering than the GeForce 8400 GS 512MB. (explain)

GeForce GTX 660 Ti		102480 Mtexels/sec
GeForce 8400 GS 512MB		5200 Mtexels/sec
	Difference: 97280 (1871%)

Pixel Rate

The GeForce GTX 660 Ti is a lot (approximately 745%) faster with regards to full screen anti-aliasing than the GeForce 8400 GS 512MB, and also should be capable of handling higher resolutions without losing too much performance. (explain)

GeForce GTX 660 Ti		21960 Mpixels/sec
GeForce 8400 GS 512MB		2600 Mpixels/sec
	Difference: 19360 (745%)

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 maximum amount of information (measured in MB per second) that can be moved across the external memory interface in a second. It is worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster 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 texture map elements (texels) that can be applied per second. This is calculated by multiplying the total texture units by the core speed of the chip. The better 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 maximum amount of pixels that the graphics chip can possibly write to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.