GPUBoss Review Our evaluation of 840M vs 820M among Laptop GPUs under 35W TDP

Gaming

GeForce 840M
5.5
GeForce 820M
5.2
GeForce 920M
5.3
Battlefield 3, Battlefield 4, Bioshock Infinite and 21 more

Graphics

GeForce 840M
8.2
GeForce 820M
8.2
GeForce 920M
8.8
T-Rex, Manhattan and Cloud Gate Factor

Computing

GeForce 840M
8.0
GeForce 820M
6.2
GeForce 920M
6.7
Face Detection, Ocean Surface Simulation and 3 more

Performance per Watt

GeForce 840M
6.5
GeForce 820M
8.9
GeForce 920M
6.3
Battlefield 3, Battlefield 4, Bioshock Infinite and 30 more

Value

GeForce 840M
5.7
GeForce 820M
6.7
GeForce 920M
5.4
Battlefield 3, Battlefield 4, Bioshock Infinite and 30 more

Noise and Power

GeForce 840M
5.0
GeForce 820M
8.8
GeForce 920M
5.0
TDP, Idle Power Consumption, Load Power Consumption and 2 more
7

Overall Score

GeForce 840M
6.8
GeForce 820M
7.0
GeForce 920M
6.5

Winner
Nvidia GeForce 840M 

GPUBoss recommends the Nvidia GeForce 840M  based on its benchmarks and compute performance.

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VS

Nvidia GeForce 840M

GPUBoss Winner
 Front view of GeForce 840M
Front view of GeForce 820M

Nvidia GeForce 820M

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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
Much higher clock speed 1,029 MHz vs 625 MHz Around 65% higher clock speed
Better 3DMark 11 graphics score 10,332 vs 7,518 More than 35% better 3DMark 11 graphics score
Better floating-point performance 790.3 GFLOPS vs 240 GFLOPS More than 3.2x better floating-point performance
Slightly better 3DMark06 score 2,338 vs 1,266.5 Around 85% better 3DMark06 score
Slightly higher pixel rate 8.23 GPixel/s vs 2.5 GPixel/s More than 3.2x higher pixel rate
More shading units 384 vs 96 288 more shading units
Better sky diver factor score 120.22 vs 66.09 More than 80% better sky diver factor score
Higher memory clock speed 1,001 MHz vs 900 MHz More than 10% higher memory clock speed
Front view of GeForce 820M

Reasons to consider the
Nvidia GeForce 820M

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Significantly higher diablo III framerate 33.9 fps vs 17.7 fps More than 90% higher diablo III framerate
Better manhattan score 3,478.25 vs 2,571 More than 35% better manhattan score
Slightly lower TDP 15W vs 33W 2.2x lower TDP

Benchmarks Real world tests of GeForce 840M vs 820M

Bitcoin mining Data courtesy CompuBench

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

Face detection Data courtesy CompuBench

GeForce 840M
22.54 mPixels/s
GeForce 820M
7.76 mPixels/s

T-Rex (GFXBench 3.0) Data courtesy CompuBench

GeForce 840M
3,358
GeForce 820M
3,364.98

Manhattan (GFXBench 3.0) Data courtesy CompuBench

GeForce 840M
2,571
GeForce 820M
3,478.25

Fire Strike Factor Data courtesy FutureMark

GeForce 840M
12.59
GeForce 820M
7.57

Sky Diver Factor Data courtesy FutureMark

GeForce 840M
120.22
GeForce 820M
66.09

Bioshock Infinite

GeForce 840M
13.55
GeForce 820M
8.1

Hitman: Absolution

GeForce 840M
6.7
GeForce 820M
4.9

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Comments

Showing 3 comments.
djmaxfly (09:23 PM, March 17, 2016)
Whats the reason for doing so much better in 3d mark? Coincidentally that is the first benchmark i ran on my new computer lol.
Finn (10:54 AM, January 18, 2016)
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.
Muhammad Asri (02:23 PM, September 15, 2015)
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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