GeForce 9400 GT 256MB vs GeForce 940M

Intro

Compare those specifications to the GeForce 940M, which features GPU core speed of 1072 MHz, and 2048 MB of DDR3 memory set to run at 1000 MHz through a 64-bit bus. It also features 384 SPUs, 24 TAUs, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The GeForce 940M should in theory be quite a bit faster than the GeForce 9400 GT 256MB in general. (explain)

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

Texel Rate

The GeForce 940M should be much (more or less 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 is much (approximately 290%) more effective at anti-aliasing than the GeForce 9400 GT 256MB, and should be capable of handling higher 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: Bandwidth is the maximum amount of data (counted in megabytes per second) that can be moved past the external memory interface within a second. It is worked out by multiplying the bus width by its memory speed. If the card has DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. 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 are processed in one second. This number is worked out by multiplying the total number of texture units 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 processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.