GeForce 825M vs GeForce 9400 GT 256MB

Intro

Compare all of that to the GeForce 9400 GT 256MB, which comes with core speeds of 550 MHz on the GPU, and 400 MHz on the 256 MB of GDDR2 RAM. It features 16 SPUs along with 8 Texture Address Units and 4 Rasterization Operator Units.

Display Graphs

Hide Graphs

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 should theoretically be a small 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 much (more or less 209%) faster with regards to anisotropic 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 is quite a bit (about 209%) faster with regards to FSAA than the GeForce 9400 GT 256MB, and should be able to handle higher resolutions better. (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 max amount of information (counted in MB per second) that can be transported across the external memory interface within a second. The number is worked out 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 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 number of texture map elements (texels) that are applied per second. This number is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

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