GPUBoss Review Our evaluation of 840M vs 820M among Laptop GPUs

Gaming

Battlefield 3, Battlefield 4, Bioshock Infinite and 21 more

Graphics

T-Rex, Manhattan, Cloud Gate Factor, Sky Diver Factor and 1 more

Computing

Face Detection, Ocean Surface Simulation and 3 more

Performance per Watt

Battlefield 3, Battlefield 4, Bioshock Infinite and 32 more

Value

Battlefield 3, Battlefield 4, Bioshock Infinite and 32 more

Noise and Power

TDP, Idle Power Consumption, Load Power Consumption and 2 more

6.7

Overall Score

Winner
Nvidia GeForce 820M 

GPUBoss recommends the Nvidia GeForce 820M  based on its gaming.

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VS
Front view of GeForce 820M

Nvidia GeForce 820M

GPUBoss Winner

Differences What are the advantages of each

Front view of GeForce 840M

Reasons to consider the
Nvidia GeForce 840M

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Much higher dead space 3 framerate 24.5 fps vs 21.7 fps Around 15% higher dead space 3 framerate
Significantly higher clock speed 1,029 MHz vs 810 MHz More than 25% higher clock speed
Better 3DMark 11 graphics score 10,332 vs 7,518 More than 35% better 3DMark 11 graphics score
Better cloud gate factor score 10.06 vs 7.43 More than 35% better cloud gate factor score
Slightly better manhattan score 3,718.04 vs 3,431.62 Around 10% better manhattan score
Slightly better video composition score 21.01 frames/s vs 14.26 frames/s More than 45% better video composition score
Higher memory clock speed 1,001 MHz vs 901 MHz More than 10% higher memory clock speed
Front view of GeForce 820M

Reasons to consider the
Nvidia GeForce 820M

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More memory 2,048 MB vs 1,024 MB 2x more memory
Higher diablo III framerate 33.9 fps vs 17.7 fps More than 90% higher diablo III framerate
More render output processors 16 vs 8 Twice as many render output processors
Wider memory bus 128 bit vs 64 bit 2x wider memory bus
More texture mapping units 32 vs 16 Twice as many texture mapping units

Benchmarks Real world tests of GeForce 840M vs 820M

Bitcoin mining Data courtesy CompuBench

GeForce 840M
91.6 mHash/s
GeForce 820M
23.28 mHash/s

Face detection Data courtesy CompuBench

GeForce 840M
22.29 mPixels/s
GeForce 820M
7.54 mPixels/s

T-Rex (GFXBench 3.0) Data courtesy CompuBench

GeForce 840M
3,359.61
GeForce 820M
3,353.8

Manhattan (GFXBench 3.0) Data courtesy CompuBench

GeForce 840M
3,718.04
GeForce 820M
3,431.62

Fire Strike Factor Data courtesy FutureMark

Sky Diver Factor Data courtesy FutureMark

GeForce 840M
119.12
GeForce 820M
65.65

Bioshock Infinite

Hitman: Absolution

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Comments

Showing 3 comments.
Whats the reason for doing so much better in 3d mark? Coincidentally that is the first benchmark i ran on my new computer lol.
Both of them are good enough for most of the games, just 840m is a slightly better. For example 820m can easily run MGSV on high ~30fps, and Dying light at low ~24fps, but the 840m would have ~5fps more.
i don't know how to read this XD...just tell me how's good gt840m and 820m.. rate between them...
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