GeForce 825M vs GeForce 9400 GT 256MB

Intro

Compare those specifications to the GeForce 9400 GT 256MB, which has a GPU core clock speed of 550 MHz, and 256 MB of GDDR2 RAM running at 400 MHz through a 128-bit bus. It also is comprised of 16 Stream Processors, 8 TAUs, and 4 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 825M		33 Watts
GeForce 9400 GT 256MB		50 Watts
	Difference: 17 Watts (52%)

Memory Bandwidth

The GeForce 825M, in theory, should perform just a bit faster than the GeForce 9400 GT 256MB in general. (explain)

GeForce 825M		14400 MB/sec
GeForce 9400 GT 256MB		12800 MB/sec
	Difference: 1600 (13%)

Texel Rate

The GeForce 825M is quite a bit (approximately 209%) better at AF than the GeForce 9400 GT 256MB. (explain)

GeForce 825M		13600 Mtexels/sec
GeForce 9400 GT 256MB		4400 Mtexels/sec
	Difference: 9200 (209%)

Pixel Rate

The GeForce 825M should be much (more or less 209%) better at anti-aliasing than the GeForce 9400 GT 256MB, and will be capable of handling higher screen resolutions without losing too much performance. (explain)

GeForce 825M		6800 Mpixels/sec
GeForce 9400 GT 256MB		2200 Mpixels/sec
	Difference: 4600 (209%)

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 megabytes per second) that can be transferred past the external memory interface in a second. It is calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card can 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 the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.