GeForce 8400 GS 512MB vs Geforce GTX 670

Intro

Compare those specifications to the Geforce GTX 670, which has GPU core speed of 915 MHz, and 2048 MB of GDDR5 RAM set to run at 1500 MHz through a 256-bit bus. It also features 1344 Stream Processors, 112 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8400 GS 512MB		40 Watts
Geforce GTX 670		170 Watts
	Difference: 130 Watts (325%)

Memory Bandwidth

The Geforce GTX 670 should in theory perform quite a bit faster than the GeForce 8400 GS 512MB in general. (explain)

Geforce GTX 670		192000 MB/sec
GeForce 8400 GS 512MB		6400 MB/sec
	Difference: 185600 (2900%)

Texel Rate

The Geforce GTX 670 should be a lot (about 1871%) faster with regards to anisotropic filtering than the GeForce 8400 GS 512MB. (explain)

Geforce GTX 670		102480 Mtexels/sec
GeForce 8400 GS 512MB		5200 Mtexels/sec
	Difference: 97280 (1871%)

Pixel Rate

If using high levels of AA is important to you, then the Geforce GTX 670 is superior to the GeForce 8400 GS 512MB, and very much so. (explain)

Geforce GTX 670		29280 Mpixels/sec
GeForce 8400 GS 512MB		2600 Mpixels/sec
	Difference: 26680 (1026%)

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 data (in units of MB per second) that can be moved 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, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This number is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly record to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.