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GeForce GT 420 vs GeForce GTX 950M

Intro

The GeForce GT 420 comes with core clock speeds of 700 MHz on the GPU, and 900 MHz on the 2048 MB of GDDR3 memory. It features 48 SPUs along with 8 TAUs and 4 Rasterization Operator Units.

Compare those specs to the GeForce GTX 950M, which features GPU core speed of 914 MHz, and 2048 MB of DDR3 memory set to run at 1000 MHz through a 128-bit bus. It also features 640 Stream Processors, 40 TAUs, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 420		50 Watts
GeForce GTX 950M		55 Watts
	Difference: 5 Watts (10%)

Memory Bandwidth

Theoretically, the GeForce GTX 950M should perform just a bit faster than the GeForce GT 420 overall. (explain)

GeForce GTX 950M		32000 MB/sec
GeForce GT 420		28800 MB/sec
	Difference: 3200 (11%)

Texel Rate

The GeForce GTX 950M will be quite a bit (about 553%) better at AF than the GeForce GT 420. (explain)

GeForce GTX 950M		36560 Mtexels/sec
GeForce GT 420		5600 Mtexels/sec
	Difference: 30960 (553%)

Pixel Rate

The GeForce GTX 950M will be much (more or less 422%) more effective at FSAA than the GeForce GT 420, and capable of handling higher screen resolutions without losing too much performance. (explain)

GeForce GTX 950M		14624 Mpixels/sec
GeForce GT 420		2800 Mpixels/sec
	Difference: 11824 (422%)

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

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GeForce GT 420

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GeForce GTX 950M

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Specifications

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Model	GeForce GT 420	GeForce GTX 950M
Manufacturer	nVidia	nVidia
Year	September 2010	March 12 2015
Code Name	GF108	GM107
Memory	2048 MB	2048 MB
Core Speed	700 MHz	914 MHz
Memory Speed	1800 MHz	2000 MHz
Power (Max TDP)	50 watts	55 watts
Bandwidth	28800 MB/sec	32000 MB/sec
Texel Rate	5600 Mtexels/sec	36560 Mtexels/sec
Pixel Rate	2800 Mpixels/sec	14624 Mpixels/sec
Unified Shaders	48	640
Texture Mapping Units	8	40
Render Output Units	4	16
Bus Type	GDDR3	DDR3
Bus Width	128-bit	128-bit
Fab Process	40 nm	28 nm
Transistors	585 million	(Unknown) million
Bus	PCIe x16	PCIe 3.0 x16
DirectX Version	DirectX 11	DirectX 12
OpenGL Version	OpenGL 4.1	OpenGL 4.5

Memory Bandwidth: Memory bandwidth is the largest amount of data (counted in MB per second) that can be transferred across the external memory interface within a second. It is calculated by multiplying the interface width by its memory speed. If it uses DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card could possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes 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 of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.

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