GeForce 940M vs GeForce GTS 150

Intro

Compare that to the GeForce GTS 150, which features a clock speed of 740 MHz and a GDDR3 memory speed of 500 MHz. It also features a 256-bit bus, and uses a 55 nm design. It is comprised of 128 SPUs, 64 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Performance-wise, the GeForce GTS 150 should in theory be a lot better than the GeForce 940M overall. (explain)

GeForce GTS 150		32000 MB/sec
GeForce 940M		16000 MB/sec
	Difference: 16000 (100%)

Texel Rate

The GeForce GTS 150 is quite a bit (more or less 84%) more effective at AF than the GeForce 940M. (explain)

GeForce GTS 150		47360 Mtexels/sec
GeForce 940M		25728 Mtexels/sec
	Difference: 21632 (84%)

Pixel Rate

The GeForce GTS 150 will be quite a bit (about 38%) better at anti-aliasing than the GeForce 940M, and also will be capable of handling higher resolutions better. (explain)

GeForce GTS 150		11840 Mpixels/sec
GeForce 940M		8576 Mpixels/sec
	Difference: 3264 (38%)

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 max amount of information (measured in megabytes per second) that can be transferred past the external memory interface within a second. The number is worked out by multiplying the bus width by its memory speed. In the case of DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied 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 higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to 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 bandwidth is, the lower the ability to reach the maximum fill rate.