GeForce 9400 GT 256MB vs GeForce GTX 880M

Intro

Compare those specifications to the GeForce GTX 880M, which uses a 28 nm design. nVidia has set the core frequency at 954 MHz. The GDDR5 memory is set to run at a speed of 1000 MHz on this card. It features 1536 SPUs along with 128 TAUs 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 will be 900% faster than the GeForce 9400 GT 256MB overall, because of its greater data rate. (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 much (about 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

The GeForce GTX 880M is quite a bit (about 1288%) faster with regards to anti-aliasing than the GeForce 9400 GT 256MB, and also will be able to handle higher resolutions without losing too much performance. (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 in one second. It's worked out by multiplying the card's bus width by the speed of its memory. If it uses DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output 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 ability to get to the max fill rate.