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GeForce 810M vs GeForce 920M

Intro

The GeForce 810M comes with a core clock frequency of 738 MHz and a DDR3 memory frequency of 900 MHz. It also uses a 64-bit bus, and uses a 28 nm design. It is made up of 48 SPUs, 8 Texture Address Units, and 4 ROPs.

Compare those specs to the GeForce 920M, which makes use of a 28 nm design. nVidia has clocked the core frequency at 954 MHz. The DDR3 memory works at a frequency of 900 MHz on this particular model. It features 384 SPUs along with 32 TAUs and 8 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Both cards have exactly the same memory bandwidth, so theoretically they should have identical performance. (explain)

Texel Rate

The GeForce 920M is a lot (approximately 417%) faster with regards to AF than the GeForce 810M. (explain)

GeForce 920M		30528 Mtexels/sec
GeForce 810M		5904 Mtexels/sec
	Difference: 24624 (417%)

Pixel Rate

The GeForce 920M should be quite a bit (about 159%) more effective at full screen anti-aliasing than the GeForce 810M, and also will be capable of handling higher resolutions without slowing down too much. (explain)

GeForce 920M		7632 Mpixels/sec
GeForce 810M		2952 Mpixels/sec
	Difference: 4680 (159%)

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 810M

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GeForce 920M

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Specifications

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Model	GeForce 810M	GeForce 920M
Manufacturer	nVidia	nVidia
Year	February 2014	March 12 2015
Code Name	GF117	GK208
Memory	1024 MB	2048 MB
Core Speed	738 MHz	954 MHz
Memory Speed	1800 MHz	1800 MHz
Power (Max TDP)	15 watts	(Unknown) watts
Bandwidth	14400 MB/sec	14400 MB/sec
Texel Rate	5904 Mtexels/sec	30528 Mtexels/sec
Pixel Rate	2952 Mpixels/sec	7632 Mpixels/sec
Unified Shaders	48	384
Texture Mapping Units	8	32
Render Output Units	4	8
Bus Type	DDR3	DDR3
Bus Width	64-bit	64-bit
Fab Process	28 nm	28 nm
Transistors	(Unknown) million	(Unknown) million
Bus	PCIe 2.0 x16	PCIe 3.0 x16
DirectX Version	DirectX 12	DirectX 12
OpenGL Version	OpenGL 4.5	OpenGL 4.5

Memory Bandwidth: Memory bandwidth is the max amount of data (counted in MB per second) that can be transferred over the external memory interface in one second. It's calculated by multiplying the card's bus width by the speed of its memory. In the case of DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, 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 number of texture map elements (texels) that are applied per second. This is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The better this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines by the the core 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 output rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

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