GeForce 8400 GS 512MB vs GeForce GT 440 1.5GB

Intro

Compare those specs to the GeForce GT 440 1.5GB, which has a GPU core clock speed of 594 MHz, and 1536 MB of GDDR3 memory set to run at 900 MHz through a 192-bit bus. It also is comprised of 144 SPUs, 24 TAUs, 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 GT 440 1.5GB		56 Watts
	Difference: 16 Watts (40%)

Memory Bandwidth

In theory, the GeForce GT 440 1.5GB should perform much faster than the GeForce 8400 GS 512MB overall. (explain)

GeForce GT 440 1.5GB		43200 MB/sec
GeForce 8400 GS 512MB		6400 MB/sec
	Difference: 36800 (575%)

Texel Rate

The GeForce GT 440 1.5GB will be a lot (about 174%) more effective at anisotropic filtering than the GeForce 8400 GS 512MB. (explain)

GeForce GT 440 1.5GB		14256 Mtexels/sec
GeForce 8400 GS 512MB		5200 Mtexels/sec
	Difference: 9056 (174%)

Pixel Rate

The GeForce GT 440 1.5GB will be a lot (about 448%) faster with regards to FSAA than the GeForce 8400 GS 512MB, and will be capable of handling higher screen resolutions without losing too much performance. (explain)

GeForce GT 440 1.5GB		14256 Mpixels/sec
GeForce 8400 GS 512MB		2600 Mpixels/sec
	Difference: 11656 (448%)

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 data (measured in MB per second) that can be moved across the external memory interface in one second. It is worked out by multiplying the bus width by its memory speed. In the case of DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This number is worked out by multiplying the total number of texture units of the card by the core clock 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 in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.