GeForce GT 130 vs GeForce GTX 850M

Intro

Compare those specs to the GeForce GTX 850M, which has a clock frequency of 876 MHz and a DDR3 memory speed of 1000 MHz. It also uses a 128-bit memory bus, and makes use of a 28 nm design. It features 640 SPUs, 40 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 850M		40 Watts
GeForce GT 130		75 Watts
	Difference: 35 Watts (88%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 850M should in theory be quite a bit better than the GeForce GT 130 in general. (explain)

GeForce GTX 850M		32000 MB/sec
GeForce GT 130		12000 MB/sec
	Difference: 20000 (167%)

Texel Rate

The GeForce GTX 850M will be quite a bit (approximately 192%) better at anisotropic filtering than the GeForce GT 130. (explain)

GeForce GTX 850M		35040 Mtexels/sec
GeForce GT 130		12000 Mtexels/sec
	Difference: 23040 (192%)

Pixel Rate

The GeForce GTX 850M will be much (more or less 75%) better at full screen anti-aliasing than the GeForce GT 130, and should be able to handle higher resolutions more effectively. (explain)

GeForce GTX 850M		14016 Mpixels/sec
GeForce GT 130		8000 Mpixels/sec
	Difference: 6016 (75%)

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 max amount of information (in units of megabytes per second) that can be transferred across the external memory interface within a second. It is calculated by multiplying the card's bus width by its memory speed. If it uses DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, 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 texture map elements (texels) that are processed in one second. This figure is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The better this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.