GeForce 9400 GT 256MB vs GeForce 940M

Intro

Compare those specs to the GeForce 940M, which makes use of a 28 nm design. nVidia has set the core frequency at 1072 MHz. The DDR3 RAM works at a speed of 1000 MHz on this particular model. It features 384 SPUs along with 24 TAUs and 8 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically speaking, the GeForce 940M should be 25% quicker than the GeForce 9400 GT 256MB in general, because of its higher data rate. (explain)

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

Texel Rate

The GeForce 940M should be much (approximately 485%) more effective 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 should be a lot (about 290%) faster with regards to FSAA than the GeForce 9400 GT 256MB, and 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 data (in units of MB per second) that can be transported past the external memory interface within a second. The number is calculated by multiplying the bus width by its memory clock speed. In the case of DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This is worked out by multiplying the total number of texture units of the card by the core clock 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 applied in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.