GeForce 840M 

Released March, 2014
  • 1 GHz
  • 1 GB DDR3
3.2 Out of 10

Explore 20 laptops with the GeForce 840M

GPUBoss Review Our evaluation of the GeForce 840M among Laptop GPUs under 35W TDP


GeForce 840M
Battlefield 3, Battlefield 4, Bioshock Infinite and 21 more


GeForce 840M
T-Rex, Manhattan and Cloud Gate Factor


GeForce 840M
Face Detection, Ocean Surface Simulation and 3 more

Performance per Watt

GeForce 840M
Battlefield 3, Battlefield 4, Bioshock Infinite and 30 more


GeForce 840M
Battlefield 3, Battlefield 4, Bioshock Infinite and 30 more

Noise and Power

GeForce 840M
TDP, Idle Power Consumption, Load Power Consumption and 2 more


Overall Score

GeForce 840M

Benchmarks Real world tests of the GeForce 840M

Bitcoin mining Data courtesy CompuBench

GeForce 840M
94.68 mHash/s
GeForce 820M
23.26 mHash/s
GeForce 920M
40.41 mHash/s

Face detection Data courtesy CompuBench

GeForce 840M
22.54 mPixels/s
GeForce 820M
7.69 mPixels/s
GeForce 920M
8.36 mPixels/s

T-Rex (GFXBench 3.0) Data courtesy CompuBench

GeForce 840M
GeForce 820M
GeForce 920M

Manhattan (GFXBench 3.0) Data courtesy CompuBench

GeForce 840M
GeForce 920M
GeForce 820M

Fire Strike Factor Data courtesy FutureMark

GeForce 840M
GeForce 920M

Sky Diver Factor Data courtesy FutureMark

GeForce 840M
GeForce 820M
GeForce 920M


GeForce 840M

Battlefield 4

GeForce 840M

Specifications Full list of technical specs


GPU brand Nvidia
GPU name GM108
Market Laptop
Clock speed 1,029 MHz
Turbo clock speed 1,124 MHz
Is dual GPU No
Reference card None

raw performance

Shading units 384
Texture mapping units 16
Render output processors 8
Pixel rate 8.23 GPixel/s
Texture rate 16.46 GTexel/s
Floating-point performance 790.3 GFLOPS


Memory clock speed 1,001 MHz
Effective memory clock speed 2,002 MHz
Memory bus 64 bit
Memory 1,024 MB
Memory type DDR3
Memory bandwidth 16.02 GB/s

noise and power

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Showing 6 comments.
those are not too... just some brains and even more money under them :D
well mine isnt a custom pc, i have an asus laptop, the cpu is 4 core intel i7 @ 2.5GHz. I have 8gb ram
Since I can confirm that my 840M did well, your issue might be somewhere else... WoT hammers CPU as hell, so gen 4+ I-series H or M (laptop)CPU is must for that game, RAM? under 6?=bottleneck for WoT.. also you need performance HDD or an SSD for better experience, random potatoes gives also lagg.. So I upgraded from 4210u and 840m to (a beast) 6700hq and 960m. Also there are rumors that 960M got a 128bit bottleneck to 2GB vram... False rumors, I run Wildlands-high~45fps-1080p- eats 3,7GB vram and runs quite smooth..(no lag- not even a bit!) Overall it doesnt matter what GPU you have, if it doesnt fit in the setup (too weak CPU, not much RAM, slow HDD) things gonna bottleneck.. Also what I noticed from upgrading from 8gb ddr4 to 12gb ddr4, GPU performance gained a little boost, I couldnt get GR:Wildlands to use over 2,5GB of Vram (maybe miss tweaked) after RAM upgrade, usage of Vram rose to 3,7 and runs smoother.. My main issue was 8GB DDR4, already 3 games out of my 60+ uses over 10GB ram under load.
i have an 840M as well... not sure which model, i cant run wot too well expect for bare minimum.. otherwise goes down to ~30fps, i can run GTA5 in low settings if i restart my laptop before starting to play, not sure about the fps i havent checked, i assume not too well but yeah..sometimes it's hard to judge if i can run a game
Same here, I havent still met any with 1GB, also I still see pretty much many false specs here.. :/ There is also a huge BUT because there are 2 geforce 840m variants one is GM107(?) and second GM108 I dont remember wich one was more powerful but as I see I have GM108 that has 24 TMUs and 16 ROPs. About the 2GB version.. all 840m variants that have 64bit bus it only uses 1GB of vRam thats the bottleneck of that card.. Overall: I'd say my gpu is around 15% more powerful with 8% OC than 940m and I still dont have any problems with everyday gaming in med-high like: WoT, CS:GO, MoW:AS2 ..etc... right now tested BF4, got quite stable 80fps in med. Thanks!
Geforce 840m has 2GB DDR3 RAM and it's RAM is not 1GB !!!
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