GeForce GT 420 vs GeForce GTX 880M

Intro

Compare that to the GeForce GTX 880M, which makes use of a 28 nm design. nVidia has set the core frequency at 954 MHz. The GDDR5 RAM works at a frequency of 1000 MHz on this particular model. It features 1536 SPUs as well as 128 TAUs and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 420		50 Watts
GeForce GTX 880M		130 Watts
	Difference: 80 Watts (160%)

Memory Bandwidth

As far as performance goes, the GeForce GTX 880M should theoretically be quite a bit superior to the GeForce GT 420 in general. (explain)

GeForce GTX 880M		128000 MB/sec
GeForce GT 420		28800 MB/sec
	Difference: 99200 (344%)

Texel Rate

The GeForce GTX 880M should be much (about 2081%) more effective at texture filtering than the GeForce GT 420. (explain)

GeForce GTX 880M		122112 Mtexels/sec
GeForce GT 420		5600 Mtexels/sec
	Difference: 116512 (2081%)

Pixel Rate

The GeForce GTX 880M should be much (approximately 990%) better at full screen anti-aliasing than the GeForce GT 420, and also able to handle higher screen resolutions more effectively. (explain)

GeForce GTX 880M		30528 Mpixels/sec
GeForce GT 420		2800 Mpixels/sec
	Difference: 27728 (990%)

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 information (counted in MB per second) that can be moved past the external memory interface within a second. The number is worked out by multiplying the interface width by its memory speed. In the case of DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This figure is worked out by multiplying the total texture units of the card by the core speed of the chip. The higher this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly record to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.