GeForce 830M vs GeForce 8400 GS 512MB

Intro

Compare those specs to the GeForce 8400 GS 512MB, which comes with a GPU core clock speed of 650 MHz, and 512 MB of DDR2 memory set to run at 400 MHz through a 64-bit bus. It also is comprised of 16 Stream Processors, 8 TAUs, and 4 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 830M		25 Watts
GeForce 8400 GS 512MB		40 Watts
	Difference: 15 Watts (60%)

Memory Bandwidth

Theoretically speaking, the GeForce 830M is 125% quicker than the GeForce 8400 GS 512MB in general, because of its greater data rate. (explain)

GeForce 830M		14400 MB/sec
GeForce 8400 GS 512MB		6400 MB/sec
	Difference: 8000 (125%)

Texel Rate

The GeForce 830M will be much (approximately 217%) better at texture filtering than the GeForce 8400 GS 512MB. (explain)

GeForce 830M		16464 Mtexels/sec
GeForce 8400 GS 512MB		5200 Mtexels/sec
	Difference: 11264 (217%)

Pixel Rate

The GeForce 830M will be quite a bit (more or less 217%) faster with regards to anti-aliasing than the GeForce 8400 GS 512MB, and also will be able to handle higher screen resolutions more effectively. (explain)

GeForce 830M		8232 Mpixels/sec
GeForce 8400 GS 512MB		2600 Mpixels/sec
	Difference: 5632 (217%)

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 data (measured in megabytes per second) that can be moved past the external memory interface in a second. It is calculated by multiplying the card's bus width by the speed of its memory. If the card has 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 amount of texture map elements (texels) that are applied in one second. This is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.