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GeForce 940M vs GeForce 9600 GSO ASUS 512

Intro

The GeForce 940M has a GPU core speed of 1072 MHz, and the 2048 MB of DDR3 RAM runs at 1000 MHz through a 64-bit bus. It also features 384 Stream Processors, 24 Texture Address Units, and 8 Raster Operation Units.

Compare all that to the GeForce 9600 GSO ASUS 512, which comes with GPU core speed of 550 MHz, and 512 MB of DDR2 memory set to run at 500 MHz through a 128-bit bus. It also is comprised of 96 SPUs, 48 TAUs, and 12 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Both cards have the exact same bandwidth, so in theory they should perform the same. (explain)

Texel Rate

The GeForce 9600 GSO ASUS 512 should be a bit (about 3%) more effective at anisotropic filtering than the GeForce 940M. (explain)

GeForce 9600 GSO ASUS 512		26400 Mtexels/sec
GeForce 940M		25728 Mtexels/sec
	Difference: 672 (3%)

Pixel Rate

The GeForce 940M will be a lot (about 30%) faster with regards to anti-aliasing than the GeForce 9600 GSO ASUS 512, and capable of handling higher screen resolutions more effectively. (explain)

GeForce 940M		8576 Mpixels/sec
GeForce 9600 GSO ASUS 512		6600 Mpixels/sec
	Difference: 1976 (30%)

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 940M

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GeForce 9600 GSO ASUS 512

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Specifications

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Model	GeForce 940M	GeForce 9600 GSO ASUS 512
Manufacturer	nVidia	nVidia
Year	March 12 2015	September 2008
Code Name	GM108	G92
Memory	2048 MB	512 MB
Core Speed	1072 MHz	550 MHz
Memory Speed	2000 MHz	1000 MHz
Power (Max TDP)	(Unknown) watts	84 watts
Bandwidth	16000 MB/sec	16000 MB/sec
Texel Rate	25728 Mtexels/sec	26400 Mtexels/sec
Pixel Rate	8576 Mpixels/sec	6600 Mpixels/sec
Unified Shaders	384	96
Texture Mapping Units	24	48
Render Output Units	8	12
Bus Type	DDR3	DDR2
Bus Width	64-bit	128-bit
Fab Process	28 nm	65 nm
Transistors	(Unknown) million	754 million
Bus	PCIe 3.0 x16	PCIe x16 2.0
DirectX Version	DirectX 12	DirectX 10
OpenGL Version	OpenGL 4.5	OpenGL 3.0

Memory Bandwidth: Bandwidth is the largest amount of data (in units of megabytes per second) that can be transferred over the external memory interface in a second. It's calculated by multiplying the interface width by its memory clock speed. In the case of DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card 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 ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

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