GeForce 840M 

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

Explore 22 laptops with the GeForce 840M
These chips are still based on Kepler (600-series), but feature more CUDA cores, more memory, a wider memory bus, and faster clockspeeds.
by Tim-Verry (Jun, 2013)
We're not sure exactly how this is done, but it's essentially a GPU version of the Turbo Boost and Turbo Core technologies we've seen from Intel and AMD CPUs for some time.
by Dustin-Sklavos (Mar, 2012)

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

Gaming

GeForce 840M
5.5
Battlefield 3, Battlefield 4, Bioshock Infinite and 21 more

Graphics

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

Computing

GeForce 840M
8.0
Face Detection, Ocean Surface Simulation and 3 more

Performance per Watt

GeForce 840M
6.1
Battlefield 3, Battlefield 4, Bioshock Infinite and 30 more

Value

GeForce 840M
5.8
Battlefield 3, Battlefield 4, Bioshock Infinite and 30 more

Noise and Power

GeForce 840M
5.0
TDP, Idle Power Consumption, Load Power Consumption and 2 more

6.7

Overall Score

GeForce 840M
6.7

Benchmarks Real world tests of the GeForce 840M

Bitcoin mining Data courtesy CompuBench

GeForce 840M
92.89 mHash/s
GeForce 820M
23.28 mHash/s
GeForce 920M
40.41 mHash/s

Face detection Data courtesy CompuBench

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

T-Rex (GFXBench 3.0) Data courtesy CompuBench

GeForce 840M
3,358
GeForce 920M
3,329.23
GeForce 820M
3,364.98

Manhattan (GFXBench 3.0) Data courtesy CompuBench

GeForce 840M
2,571
GeForce 920M
3,690.63
GeForce 820M
3,478.25

Fire Strike Factor Data courtesy FutureMark

GeForce 840M
12.59
GeForce 920M
10.41

Sky Diver Factor Data courtesy FutureMark

GeForce 840M
120.22
GeForce 820M
66.09
GeForce 920M
102.8

Thief

GeForce 840M
9.1

Battlefield 4

GeForce 840M
11.2

In The News From around the web

19
Mar

NVIDIA Announces Quadro M6000 & Quadro VCA (2015)

by Ryan Smith |
www.anandtech.com
However the company is also pushing the use of Physically Based Rendering (PBR), a compute-intensive rendering solution that uses far more accurate rendering algorithms to accurately model the physical characteristic of a material, in essence properly capturing how light will interact with that material and reflect off of it rather than using a rough approximation.
However as FP64 compute is not widely used in graphics, this is not something NVIDIA believes will be an issue.
17
Dec

Roadmap reveals Nvidia's Geforce 800M mobile lineup

by Slobodan Simic |
www.fudzilla.com
Although it is not clear if OEMs like Clevo will get it in February or we will actually see some notebook with new Nvidia Geforce 800M parts on retail/e-tail shelves in February, we are quite sure we will hear more about them during CES 2014.
The high-end lineup includes the GTX 880M and the GTX 870M and according to Clevo's roadmap, the GTX 880M and the GTX 860M will show up in a couple of Clevo notebook models running in SLI configuration.
Nvidia would also most probably release a 880M SLI Configuration which would be the king of mobile graphics for a year or so.
Details about Maxwell’s Mobility series surfaced a few days back and now predicted benchmarks have also surfaced.
So let’s talk about the GPUs themselves, NVIDIA’s first tier chips would be MXM design which means they would be interchangeable, upgradable and even offer SLI support on some notebook designs.
Next up, we have the entry level models which will feature the onboard design which mean that these GPUs will be permanently soldered to the mainboard hence no upgrading can be possible.

Specifications Full list of technical specs

gpu

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

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

TDP 33W
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Comments

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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