GeForce 9400 GT 256MB vs GeForce GTX 880M

Intro

Compare all that to the GeForce GTX 880M, which comes with a clock frequency of 954 MHz and a GDDR5 memory speed of 1000 MHz. It also uses a 256-bit bus, and uses a 28 nm design. It is comprised of 1536 SPUs, 128 Texture Address Units, and 32 Raster Operation Units.

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 a lot 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 will be a lot (approximately 2675%) better 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

If running with a high screen resolution is important to you, then the GeForce GTX 880M is superior to the GeForce 9400 GT 256MB, by far. (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: Memory bandwidth is the largest amount of information (counted in megabytes per second) that can be transported across the external memory interface within a second. It's calculated by multiplying the bus width by its memory speed. If it uses DDR memory, the result should be multiplied by 2 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, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This figure is calculated by multiplying the total amount of texture units 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 processed in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of 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 output rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.