Select any two GPUs for comparison
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Gaming Performance Comparison

Recommended System Requirements
Game GeForce 840M 2GB GeForce GT 520M
Cyberpunk 2077 559% 2140%
Assassins Creed: Valhalla 508% 1967%
Call of Duty: Black Ops Cold War 576% 2200%
Mafia: Definitive Edition 853% 3140%
eFootball PES 2021 235% 1040%
Genshin Impact 565% 2160%
FIFA 21 235% 1040%
Death Stranding 565% 2160%
Watch Dogs Legion 541% 2080%
Microsoft Flight Simulator 488% 1900%

In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce 840M 2GB are massively better than the Nvidia GeForce GT 520M.

The GeForce 840M 2GB has a 289 MHz higher core clock speed and 16 more Texture Mapping Units than the GeForce GT 520M. This results in the GeForce 840M 2GB providing 18.8 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 840M 2GB has a 289 MHz higher core clock speed and 4 more Render Output Units than the GeForce GT 520M. This results in the GeForce 840M 2GB providing 5.2 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 840M 2GB was released over three years more recently than the GeForce GT 520M, and so the GeForce 840M 2GB is likely to have far better driver support, meaning it will be much more optimized and ultimately superior to the GeForce GT 520M when running the latest games.

The GeForce 840M 2GB has 1024 MB more video memory than the GeForce GT 520M, so is likely to be much better at displaying game textures at higher resolutions. This is supported by the fact that the GeForce 840M 2GB also has superior memory performance overall.

The GeForce 840M 2GB has 3.2 GB/sec greater memory bandwidth than the GeForce GT 520M, which means that the memory performance of the GeForce 840M 2GB is marginally better than the GeForce GT 520M.

The GeForce 840M 2GB has 384 Shader Processing Units and the GeForce GT 520M has 48. However, the actual shader performance of the GeForce 840M 2GB is 583 and the actual shader performance of the GeForce GT 520M is 71. The GeForce 840M 2GB having 512 better shader performance and an altogether better performance when taking into account other relevant data means that the GeForce 840M 2GB delivers a noticeably smoother and more efficient experience when processing graphical data than the GeForce GT 520M.

The GeForce 840M 2GB transistor size technology is 12 nm (nanometers) smaller than the GeForce GT 520M. This means that the GeForce 840M 2GB is expected to run slightly cooler and achieve higher clock frequencies than the GeForce GT 520M.

The GeForce 840M 2GB requires 33 Watts to run and the GeForce GT 520M requires 12 Watts. The GeForce 840M 2GB requires 21 Watts more than the GeForce GT 520M 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 GT 520M.

Game FPS Benchmarks On Ultra

GPU Architecture

Core Speed1029 MHzvs740 MHz
Boost Clock1124 MHzvs-
ArchitectureMaxwell GM108Fermi GF119
OC Potential Poor vs Poor
Driver Support Great vs Poor
Release Date12 Mar 2014vs05 Jan 2011
GPU LinkGD LinkGD Link
Approved
Comparison

Resolution Performance

1366x768
7
green tick vs
4.1
1600x900
5.4
green tick vs
2.7
1920x1080
3.9
green tick vs
1.8
2560x1440
2.6
green tick vs
1.3
3840x2160
1.7
green tick vs -

GPU Memory

Memory2048 MBvs1024 MB
Memory Speed1001 MHzvs800 MHz
Memory Bus64 Bitvs64 Bit
Memory TypeDDR3vsDDR3
Memory Bandwidth16GB/secvs12.8GB/sec
L2 Cache 1024 KB green tick vs 128 KB
Delta Color Compression no vs no
Memory Performance 0% green tick vs green tick 0%
Comparison

GPU Display

Shader Processing Units384vs48
Actual Shader Performance28%vs3%
Technology28nmvs40nm
Texture Mapping Units24vs8
Texture Rate24.7 GTexel/svs5.9 GTexel/s
Render Output Units8vs4
Pixel Rate8.2 GPixel/svs3 GPixel/s
Comparison

GPU Outputs

Max Digital Resolution (WxH)4096x2160vs2560x1600
VGA Connections0vs0
DVI Connections0vs1
HDMI Connections0vs0
DisplayPort Connections-vs-
Comparison

GPU Power Requirements

Max Power33 Wattsvs12 Watts
Recommended PSU--

GPU Features

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

GPU Supporting Hardware

Recommended ProcessorIntel Core i3-4100M 2.5GHzvsIntel Core i3-2310M 2.1GHz
Recommended RAM4 GBvs3 GB
Maximum Recommended Gaming Resolution1366x768vs1024x768

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 GT 520M is a entry-level Mobile Graphics Card based on the second revision of the Fermi Architecture.

Architecture
The Fermi Architecture is manufactured with a 40nm technology and uses a technique known as Hot Clocking: The Shaders are clocked twice as fast as the Central Unit. While this leads to a reasonable performance boost, it causes enormous amounts of energy dissipation, leading, ultimately, to a significantly higher operating temperature.
Fermi is also the first GPU architecture with fully cached memory access which increases memory performance.

GPU
It equips a GPU Codenamed GF119 which has 1 Stream Multiprocessors activated and thus offers 48 Shader Processing Units, 8 TMUs and 4 ROPs. The Central Unit is clocked at 740MHz.

Memory
The GPU accesses a 1GB frame buffer of DDR3, through a 64-bit memory interface. The size of the frame buffer is exaggerated and no way benefits the GPU. The Memory Clock Operates at 800MHz.

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

Power Consumption
With a rated board TDP of 12W, it is suited for very small laptops.

Performance
Gaming benchmarks put its performance somewhat below a desktop GeForce GT 420.

System Suggestions
We recommend a modest processor (Intel Core i3 Mobile) and 4GB of RAM for a system with GeForce GT 520M.
Recommended CPU
Possible GPU Upgrades
N/A
N/A
GPU Variants
-
-