Select any two GPUs for comparison
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Gaming Performance Comparison

Recommended System Requirements
Game GeForce 940M 4GB GeForce 840M 2GB
Red Dead Redemption 2 494% 529%
Cyberpunk 2077 717% 765%
Doom Eternal 411% 441%
Dragon Ball Z Kakarot 267% 288%
Call of Duty: Modern Warfare 494% 529%
Microsoft Flight Simulator 717% 765%
FIFA 20 217% 235%
Grand Theft Auto VI 808% 862%
Star Wars: Jedi - Fallen Order 717% 765%
Need For Speed Heat 494% 529%

In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce 940M 4GB are very slightly better than the Nvidia GeForce 840M 2GB.

The GeForce 940M 4GB has a 43 MHz higher core clock speed and the same number of Texture Mapping Units as the GeForce 840M 2GB. This results in the GeForce 940M 4GB providing 1 GTexel/s better texturing performance. This still holds weight but shader performance is generally more relevant, particularly since both of these GPUs support at least DirectX 10.

The GeForce 940M 4GB has a 43 MHz higher core clock speed than the GeForce 840M 2GB and the same number of Render Output Units. This results in the GeForce 940M 4GB providing 0.4 GPixel/s better pixeling performance. However, both GPUs support DirectX 9 or above, and pixeling performance is only really relevant when comparing older cards.

The GeForce 940M 4GB was released over a year more recently than the GeForce 840M 2GB, and so the GeForce 940M 4GB is likely to have better driver support, meaning it will be more optimized for running the latest games when compared to the GeForce 840M 2GB.

The GeForce 940M 4GB has 2048 MB more video memory than the GeForce 840M 2GB, so is likely to be much better at displaying game textures at higher resolutions. However, overall, the GeForce 840M 2GB has superior memory performance.

The memory bandwidth of the GeForce 940M 4GB and the GeForce 840M 2GB are the same, which means the GeForce 940M 4GB and the GeForce 840M 2GB have equal limitations when it comes to graphical data transfer.

Both the GeForce 940M 4GB and the GeForce 840M 2GB have 384 Shader Processing Units. While the two GPUs have the same number of SPUs, the actual performance delivered by the GeForce 940M 4GB is 610 and by the GeForce 840M 2GB is 583. Knowing that the shader performance of the GeForce 940M 4GB is superior, it is not necessary to examine the GPUs' respective Texture and Pixel Fill Rates.

The GeForce 940M 4GB requires 25 Watts to run and the GeForce 840M 2GB requires 33 Watts. The GeForce 840M 2GB requires 8 Watts more than the GeForce 940M 4GB to run. The difference is not significant enough for the GeForce 840M 2GB to have a noticeably larger impact on your yearly electricity bills than the GeForce 940M 4GB.

Game FPS Benchmarks On Ultra

GPU Architecture

Core Speed1072 MHzvs1029 MHz
Boost Clock1176 MHzvs1124 MHz
ArchitectureMaxwell GM108-N16S-GT-SMaxwell GM108
OC Potential Poor vs Poor
Driver Support Great vs Great
Release Date13 Mar 2015vs12 Mar 2014
GPU LinkGD LinkGD Link
Approved
Comparison

Resolution Performance

1366x768
7.2
green tick vs
7
1600x900
5.5
green tick vs
5.4
1920x1080
4.1
green tick vs
3.9
2560x1440
2.7
green tick vs
2.6
3840x2160
1.8
green tick vs
1.7

GPU Memory

Memory4096 MBvs2048 MB
Memory Speed1000 MHzvs1001 MHz
Memory Bus64 Bitvs64 Bit
Memory TypeDDR3vsDDR3
Memory Bandwidth16GB/secvs16GB/sec
L2 Cache 2048 KB green tick vs 1024 KB
Delta Color Compression no vs no
Memory Performance 0% green tick vs green tick 0%
Comparison

GPU Display

Shader Processing Units384vs384
Actual Shader Performance29%vs28%
Technology28nmvs28nm
Texture Mapping Units24vs24
Texture Rate25.7 GTexel/svs24.7 GTexel/s
Render Output Units8vs8
Pixel Rate8.6 GPixel/svs8.2 GPixel/s
Comparison

GPU Outputs

Max Digital Resolution (WxH)4096x2160vs4096x2160
VGA Connections0vs0
DVI Connections0vs0
HDMI Connections0vs0
DisplayPort Connections0vs-
Comparison

GPU Power Requirements

Max Power25 Wattsvs33 Watts
Recommended PSU--

GPU Features

DirectX12.0vs12.0
Shader Model5.0vs5.0
Open GL4.5vs4.5
Open CL-vs-
Notebook GPUyesyes
SLI/Crossfirenovsno
Dedicatedyesvsyes
Comparison

GPU Supporting Hardware

Recommended ProcessorIntel Core i3-4110M 2.6GHzvsIntel Core i3-4100M 2.5GHz
Recommended RAM8 GBvs4 GB
Maximum Recommended Gaming Resolution1366x768vs1366x768

Gaming Performance Value

Performance Value

GPU Mini Review

Mini ReviewOverview
GeForce 940M 4GB is a Middle-Class Mobile Graphics Card based on the First Generation of the Maxwell architecture.

Architecture
GeForce 940M offers the GM108-N16S-GT-S GPU, which is a First Gen Maxwell GPU. It has support for feature level of DirectX 12.0.
The GM108-N16S-GT-S GPU has 3 Stream Multiprocessors activated and offers 384 Shader Processing Units, 24 TMUs and 8 ROPs.

GPU
The central unit runs at 1072MHz and goes up to 1176MHz, in Turbo Mode.

Memory: Speed
The GPU is equipped with DDR3 and Accesses the Frame Buffer through a 64-bit Memory Interface. The Memory Clock Operates at 1000MHz.

Memory: Frame Buffer
The GPU can fill up a Memory Pool of up to 4GB. Under most circumstances, this only proves useful in certain 3D Games whose Settings Require Large Amounts of Memory.
However, because the GPU itself is too weak to work under other circumstances in which 4GB of Memory are needed - such as 4K Gaming, a Large Frame Buffer is mostly a Gimmick.

Power Consumption
With a rated board TDP of 25W, it will only be equipped in average sized notebooks.

Performance
GeForce 940M is essentially a higher-clocked GeForce 840M. Because of that, it is only slightly faster than its predecessor. Modern games are expected to run at Medium Settings while demanding games will required further reduced settings.

System Suggestions
We recommend a Middle-Class Processor and 4GB of RAM for Optimal Performance.
Overview
GeForce 840M 2GB is a Middle-Class Mobile Graphics Card based on the First Revision of the Maxwell architecture.

Architecture
The Maxwell architecture features many improvements and among them is the extremely large L2 Cache which allows NVIDIA to produce Graphics Cards with relatively small memory data transfer rates, without causing too much impact on the overall performance. Furthermore, the Shaders have been redesigned and are both more powerful and energy efficient.

GPU
It equips a GPU codenamed GM108 which has 3 SM activated and thus offers 384 Shader Processing Units, 24 TMUs and 8 ROPs. The central unit runs at 1029MHz and goes up to 1124MHz, in Turbo Mode.

Memory
The GPU accesses a 2GB frame buffer of DDR3, through a 64-bit memory interface. The Frame Buffer is exaggerated and in no way benefits the GPU. The memory clock operates at 1001MHz.

Features
DirectX 11.2 Support (11.0 Hardware Default) and support for GPU Boost 2.0, GeForce Experience, PhysX and other technologies.

Power Consumption
With a rated board TDP of 33W, it will only be equipped in average sized notebooks.

Performance
Benchmarks indicate its performance is over 20% faster than the older GeForce GT 740M. Therefore, it should match GeForce GT 750M.

System Suggestions
We recommend a modest processor (Intel Core i5 Mobile) and 4GB of RAM for a notebook with GeForce 840M 2GB.
Recommended CPU
Possible GPU Upgrades
N/A
N/A
GPU Variants
-
-

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