Select any two GPUs for comparison
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Gaming Performance Comparison

Recommended System Requirements
Game GeForce 840M 2GB GeForce GTX 670MX
Cyberpunk 2077 559% 293%
Assassins Creed: Valhalla 508% 263%
Genshin Impact 565% 296%
FIFA 21 235% 100%
Watch Dogs Legion 541% 282%
eFootball PES 2021 235% 100%
Call of Duty: Black Ops Cold War 576% 304%
Microsoft Flight Simulator 488% 251%
Marvel's Avengers 529% 275%
Mafia: Definitive Edition 853% 468%

In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce GTX 670MX are significantly better than the Nvidia GeForce 840M 2GB.

The GeForce 840M 2GB has a 428 MHz higher core clock speed than the GeForce GTX 670MX, but the GeForce GTX 670MX has 56 more Texture Mapping Units than the GeForce 840M 2GB. As a result, the GeForce GTX 670MX exhibits a 23.4 GTexel/s better Texture Fill Rate than the GeForce 840M 2GB. This still holds weight but shader performance is generally more relevant, particularly since both of these GPUs support at least DirectX 10.

The GeForce 840M 2GB has a 428 MHz higher core clock speed than the GeForce GTX 670MX, but the GeForce GTX 670MX has 16 more Render Output Units than the GeForce 840M 2GB. As a result, the GeForce GTX 670MX exhibits a 6.2 GPixel/s better Pixel Fill Rate than the GeForce 840M 2GB. However, both GPUs support DirectX 9 or above, and pixeling performance is only really relevant when comparing older cards.

The GeForce 840M 2GB was released over a year more recently than the GeForce GTX 670MX, and so the GeForce 840M 2GB is likely to have better driver support, meaning it will be more optimized for running the latest games when compared to the GeForce GTX 670MX.

The GeForce GTX 670MX has 1024 MB more video memory than the GeForce 840M 2GB, so is likely to be much better at displaying game textures at higher resolutions. This is supported by the fact that the GeForce GTX 670MX also has superior memory performance overall.

The GeForce GTX 670MX has 51.2 GB/sec greater memory bandwidth than the GeForce 840M 2GB, which means that the memory performance of the GeForce GTX 670MX is much better than the GeForce 840M 2GB.

The GeForce 840M 2GB has 384 Shader Processing Units and the GeForce GTX 670MX has 960. However, the actual shader performance of the GeForce 840M 2GB is 583 and the actual shader performance of the GeForce GTX 670MX is 577. The GeForce 840M 2GB having 6 better shader performance is not particularly notable, as altogether the GeForce GTX 670MX performs better when taking into account other relevant data.

The GeForce 840M 2GB requires 33 Watts to run and the GeForce GTX 670MX requires 75 Watts. The GeForce GTX 670MX requires 42 Watts more than the GeForce 840M 2GB to run. The difference is significant enough that the GeForce GTX 670MX may have a slight adverse affect on your yearly electricity bills in comparison to the GeForce 840M 2GB.

Game FPS Benchmarks On Ultra

GPU Architecture

Core Speed1029 MHzvs601 MHz
Boost Clock1124 MHzvs-
ArchitectureMaxwell GM108Kepler GK104-N13E-GR-A2
OC Potential Poor vs Fair
Driver Support Great vs Good
Release Date12 Mar 2014vs01 Oct 2012
GPU LinkGD LinkGD Link
Approved
Comparison

Resolution Performance

1366x768
7
vs green tick
8.9
1600x900
5.4
vs green tick
6.8
1920x1080
3.9
vs green tick
5.3
2560x1440
2.6
vs green tick
3.3
3840x2160
1.7
vs green tick
2.2

GPU Memory

Memory2048 MBvs3072 MB
Memory Speed1001 MHzvs700 MHz
Memory Bus64 Bitvs192 Bit
Memory TypeDDR3vsGDDR5
Memory Bandwidth16GB/secvs67.2GB/sec
L2 Cache 1024 KB green tick vs 384 KB
Delta Color Compression no vs no
Memory Performance 0% green tick vs green tick 0%
Comparison

GPU Display

Shader Processing Units384vs960
Actual Shader Performance28%vs28%
Technology28nmvs28nm
Texture Mapping Units24vs80
Texture Rate24.7 GTexel/svs48.1 GTexel/s
Render Output Units8vs24
Pixel Rate8.2 GPixel/svs14.4 GPixel/s
Comparison

GPU Outputs

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

GPU Power Requirements

Max Power33 Wattsvs75 Watts
Recommended PSU--

GPU Features

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

GPU Supporting Hardware

Recommended ProcessorIntel Core i3-4100M 2.5GHzvsIntel Core i7-3610QM 4-Core 2.3GHz
Recommended RAM4 GBvs8 GB
Maximum Recommended Gaming Resolution1366x768vs1920x1080

Gaming Performance Value

Performance Value

GPU Mini Review

Mini ReviewOverview
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.
Overview
GeForce GTX 670MX is a Performance Mobile Graphics Card based on the first revision of the Kepler Architecture.

Architecture
The Kepler Architecture was NVIDIA's big step to power efficiency. Each Stream Multiprocessor (SMX) now hosts 192 Shader Processing Units - against the 48 of older Fermi Architecture, and has been redesigned being now clocked at the same speed of the Central Unit. This means they are more energy efficient and will consequently lead to cooler operating temperatures. However, it also means they are weaker. It can be said that one Fermi SMX is as fast as 2 Kepler SMXs.
Additionally, and not available in all GPUs, Kepler also introduced the Boost Clock Feature. The Boost Clock is an even higher Clock Speed activated when in gaming mode and becomes the effective speed of the GPU.

GPU
It equips a GPU Codenamed Kepler GK104-N13E-GR-A2 which has 5 Stream Multiprocessors activated and thus offers 960 Shader Processing Units, 80 TMUs and 24 ROPs. The Central Unit is clocked at 601MHz.

Memory
The GPU accesses a 3GB frame buffer of fast GDDR5, through a 192-bit memory interface. The size of the frame buffer is exaggerated and no way benefits the GPU. The Memory Clock Operates at 700MHz.

Features
DirectX 11.0 Support (11.0 Hardware Default) and support for SLI, Optimus, CUDA, OpenCL, DirectCompute, 3D Vision Surround, PhysX, Realtime Raytracing and other technologies

Power Consumption
With a rated board TDP of 75W, it is suited for large sized laptops.

Performance
Gaming benchmarks indicate is not too far from the desktop GeForce GTX 650 Ti.

System Suggestions
We recommend a Power Processor (Intel Core i7 Mobile) and 8GB of RAM for a system with GeForce GTX 670MX.
Recommended CPU
Possible GPU Upgrades
N/A
N/A
GPU Variants
-