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GeForce 820M vs GeForce 920M

Intro

The GeForce 820M uses a 28 nm design. nVidia has set the core speed at 719 MHz. The DDR3 memory works at a frequency of 1000 MHz on this particular model. It features 96 SPUs as well as 16 TAUs and 4 Rasterization Operator Units.

Compare all of that to the GeForce 920M, which features a core clock frequency of 954 MHz and a DDR3 memory speed of 900 MHz. It also makes use of a 64-bit bus, and uses a 28 nm design. It features 384 SPUs, 32 TAUs, and 8 Raster Operation Units.

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

GeForce 920M		1180 points
GeForce 820M		850 points
	Difference: 330 (39%)

Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the GeForce 820M should in theory be a small bit superior to the GeForce 920M in general. (explain)

GeForce 820M		16000 MB/sec
GeForce 920M		14400 MB/sec
	Difference: 1600 (11%)

Texel Rate

The GeForce 920M should be a lot (approximately 165%) faster with regards to texture filtering than the GeForce 820M. (explain)

GeForce 920M		30528 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 19024 (165%)

Pixel Rate

The GeForce 920M is much (about 165%) better at AA than the GeForce 820M, and also should be able to handle higher resolutions better. (explain)

GeForce 920M		7632 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 4756 (165%)

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 820M

Amazon.com

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GeForce 920M

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Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model	GeForce 820M	GeForce 920M
Manufacturer	nVidia	nVidia
Year	February 2014	March 12 2015
Code Name	GF117	GK208
Memory	2048 MB	2048 MB
Core Speed	719 MHz	954 MHz
Memory Speed	2000 MHz	1800 MHz
Power (Max TDP)	15 watts	(Unknown) watts
Bandwidth	16000 MB/sec	14400 MB/sec
Texel Rate	11504 Mtexels/sec	30528 Mtexels/sec
Pixel Rate	2876 Mpixels/sec	7632 Mpixels/sec
Unified Shaders	96	384
Texture Mapping Units	16	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: Bandwidth is the maximum amount of information (in units of MB per second) that can be moved past the external memory interface in a second. It's worked out by multiplying the card's interface width by its memory clock speed. In the case of DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster 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 number is calculated by multiplying the total texture units by the core speed of the chip. The higher this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

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

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