GeForce 825M vs GeForce 9400 GT 256MB

Intro

Compare those specs to the GeForce 9400 GT 256MB, which has GPU clock speed of 550 MHz, and 256 MB of GDDR2 memory set to run at 400 MHz through a 128-bit bus. It also is made up of 16 SPUs, 8 Texture Address Units, 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 a little bit faster than the GeForce 9400 GT 256MB overall. (explain)

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

Texel Rate

The GeForce 825M is a lot (approximately 209%) better at texture filtering 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 will be much (about 209%) faster with regards to anti-aliasing than the GeForce 9400 GT 256MB, and also 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: Bandwidth is the largest amount of information (counted in megabytes per second) that can be transported across the external memory interface in a second. It is calculated by multiplying the interface width by the speed of its memory. If the card has DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's 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 applied in one second. This 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 graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the the card's 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 output rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.