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GeForce 820M vs GeForce 940M

Intro

The GeForce 820M features a core clock speed of 719 MHz and a DDR3 memory frequency of 1000 MHz. It also makes use of a 64-bit memory bus, and makes use of a 28 nm design. It is made up of 96 SPUs, 16 Texture Address Units, and 4 Raster Operation Units.

Compare that to the GeForce 940M, which has core speeds of 1072 MHz on the GPU, and 1000 MHz on the 2048 MB of DDR3 memory. It features 384 SPUs along with 24 TAUs and 8 Rasterization Operator 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 940M		1740 points
GeForce 820M		850 points
	Difference: 890 (105%)

Power Usage and Theoretical Benchmarks

Memory Bandwidth

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

Texel Rate

The GeForce 940M will be a lot (more or less 124%) more effective at texture filtering than the GeForce 820M. (explain)

GeForce 940M		25728 Mtexels/sec
GeForce 820M		11504 Mtexels/sec
	Difference: 14224 (124%)

Pixel Rate

If using high levels of AA is important to you, then the GeForce 940M is superior to the GeForce 820M, by a large margin. (explain)

GeForce 940M		8576 Mpixels/sec
GeForce 820M		2876 Mpixels/sec
	Difference: 5700 (198%)

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 940M

Amazon.com

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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 940M
Manufacturer	nVidia	nVidia
Year	February 2014	March 12 2015
Code Name	GF117	GM108
Memory	2048 MB	2048 MB
Core Speed	719 MHz	1072 MHz
Memory Speed	2000 MHz	2000 MHz
Power (Max TDP)	15 watts	(Unknown) watts
Bandwidth	16000 MB/sec	16000 MB/sec
Texel Rate	11504 Mtexels/sec	25728 Mtexels/sec
Pixel Rate	2876 Mpixels/sec	8576 Mpixels/sec
Unified Shaders	96	384
Texture Mapping Units	16	24
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 maximum amount of information (in units of megabytes per second) that can be transferred past the external memory interface within a second. It's worked out by multiplying the card's bus width by the speed of its memory. If the card has DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines by the the card's clock speed. 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 lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.

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