GeForce 9400 GT 256MB vs GeForce GTX 880M

Intro

Compare that to the GeForce GTX 880M, which features GPU core speed of 954 MHz, and 4096 MB of GDDR5 RAM set to run at 1000 MHz through a 256-bit bus. It also is made up of 1536 SPUs, 128 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 9400 GT 256MB		50 Watts
GeForce GTX 880M		130 Watts
	Difference: 80 Watts (160%)

Memory Bandwidth

In theory, the GeForce GTX 880M should perform much faster than the GeForce 9400 GT 256MB overall. (explain)

GeForce GTX 880M		128000 MB/sec
GeForce 9400 GT 256MB		12800 MB/sec
	Difference: 115200 (900%)

Texel Rate

The GeForce GTX 880M should be quite a bit (more or less 2675%) more effective at texture filtering than the GeForce 9400 GT 256MB. (explain)

GeForce GTX 880M		122112 Mtexels/sec
GeForce 9400 GT 256MB		4400 Mtexels/sec
	Difference: 117712 (2675%)

Pixel Rate

The GeForce GTX 880M will be a lot (approximately 1288%) better at FSAA than the GeForce 9400 GT 256MB, and also capable of handling higher screen resolutions while still performing well. (explain)

GeForce GTX 880M		30528 Mpixels/sec
GeForce 9400 GT 256MB		2200 Mpixels/sec
	Difference: 28328 (1288%)

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 data (measured in MB per second) that can be moved across the external memory interface within a second. It is worked out by multiplying the card's bus width by the speed of its memory. If it uses DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better 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 are applied per second. This number is calculated by multiplying the total amount of texture units 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 that the graphics chip could possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the the core 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 fill rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.