GeForce 9400 GT 256MB vs GeForce 940M

Intro

Compare those specifications to the GeForce 940M, which makes use of a 28 nm design. nVidia has clocked the core frequency at 1072 MHz. The DDR3 RAM is set to run at a frequency of 1000 MHz on this particular model. It features 384 SPUs as well as 24 Texture Address Units and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Performance-wise, the GeForce 940M should in theory be a lot superior to the GeForce 9400 GT 256MB overall. (explain)

GeForce 940M		16000 MB/sec
GeForce 9400 GT 256MB		12800 MB/sec
	Difference: 3200 (25%)

Texel Rate

The GeForce 940M will be much (approximately 485%) better at AF than the GeForce 9400 GT 256MB. (explain)

GeForce 940M		25728 Mtexels/sec
GeForce 9400 GT 256MB		4400 Mtexels/sec
	Difference: 21328 (485%)

Pixel Rate

The GeForce 940M will be a lot (more or less 290%) better at AA than the GeForce 9400 GT 256MB, and should be capable of handling higher screen resolutions without slowing down too much. (explain)

GeForce 940M		8576 Mpixels/sec
GeForce 9400 GT 256MB		2200 Mpixels/sec
	Difference: 6376 (290%)

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 (measured in MB per second) that can be transported over the external memory interface in one second. It's worked out by multiplying the interface width by the speed of its memory. If it uses DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster 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 texture map elements (texels) that can be applied per second. This is calculated by multiplying the total number of texture units of the card 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 in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that 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 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 rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.