Select any two GPUs for comparison
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Gaming Performance Comparison

Recommended System Requirements
Game Radeon HD 8400 GeForce 840M 2GB
Halo: Reach 510% 100%
Cyberpunk 2077 2539% 765%
Red Dead Redemption 2 1821% 529%
Dragon Ball Z Kakarot 1085% 288%
Call of Duty: Modern Warfare 1821% 529%
Microsoft Flight Simulator 2539% 765%
Doom Eternal 1552% 441%
Grand Theft Auto VI 2835% 862%
FIFA 20 923% 235%
Need For Speed Heat 1821% 529%

In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce 840M 2GB are massively better than the AMD Radeon HD 8400.

The GeForce 840M 2GB has a 429 MHz higher core clock speed and 16 more Texture Mapping Units than the Radeon HD 8400. This results in the GeForce 840M 2GB providing 19.9 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 429 MHz higher core clock speed and 4 more Render Output Units than the Radeon HD 8400. This results in the GeForce 840M 2GB providing 5.8 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 less than a year after the Radeon HD 8400, and so they are likely to have similar driver support for optimizing performance when running the latest games.

The GeForce 840M 2GB has 2048 MB video memory, but the Radeon HD 8400 does not have an entry, so the two GPUs cannot be reliably compared in this area.

The Radeon HD 8400 has 128 Shader Processing Units and the GeForce 840M 2GB has 384. However, the actual shader performance of the Radeon HD 8400 is 50 and the actual shader performance of the GeForce 840M 2GB is 583. The GeForce 840M 2GB having 533 better shader performance and an altogether better performance when taking into account other relevant data means that the GeForce 840M 2GB delivers a slightly smoother and more efficient experience when processing graphical data than the Radeon HD 8400.

The Radeon HD 8400 requires 25 Watts to run and the GeForce 840M 2GB requires 33 Watts. The GeForce 840M 2GB requires 8 Watts more than the Radeon HD 8400 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 Radeon HD 8400.

Game FPS Benchmarks On Ultra

GPU Architecture

Core Speed600 MHzvs1029 MHz
Boost Clock-vs1124 MHz
ArchitectureKalindiMaxwell GM108
OC Potential - vs Poor
Driver Support - vs Great
Release Date23 May 2013vs12 Mar 2014
GPU LinkGD LinkGD Link
Approved
Comparison

Resolution Performance

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

GPU Memory

MemoryN/Avs2048 MB
Memory Speed800 MHzvs1001 MHz
Memory Bus128 Bitvs64 Bit
Memory TypeDDR3vsDDR3
Memory Bandwidth25.6GB/secvs16GB/sec
L2 Cache - vs green tick 1024 KB
Delta Color Compression no vs no
Memory Performance 0% green tick vs green tick 0%
Comparison

GPU Display

Shader Processing Units128vs384
Actual Shader Performance2%vs28%
Technology28nmvs28nm
Texture Mapping Units8vs24
Texture Rate4.8 GTexel/svs24.7 GTexel/s
Render Output Units4vs8
Pixel Rate2.4 GPixel/svs8.2 GPixel/s
Comparison

GPU Outputs

Max Digital Resolution (WxH)-vs4096x2160
VGA Connections0vs0
DVI Connections0vs0
HDMI Connections0vs0
DisplayPort Connections-vs-
Comparison

GPU Power Requirements

Max Power25 Wattsvs33 Watts
Recommended PSU--

GPU Features

DirectX11.1vs12.0
Shader Model5.0vs5.0
Open GL4.3vs4.5
Open CL-vs-
Notebook GPUyesyes
SLI/Crossfirenovsno
Dedicatednovsyes
Comparison

GPU Supporting Hardware

Recommended Processor-Intel Core i3-4100M 2.5GHz
Recommended RAM-4 GB
Maximum Recommended Gaming Resolution-1366x768

Gaming Performance Value

Performance Value

GPU Mini Review

Mini ReviewRadeon HD 8400 is an integrated graphics card on some of the Kabini APUs.
It is based on the Graphics Core Next Architecture and shares the main system memory of up to 800MHz, on a 128-bit memory interface, whereas the memory bandwidth and performance will depend heavily on the laptop configuration.
The codenamed Kalindi Core offers 128 Shader Processing Units, 8 TMUs and 4 ROPs.
Assuming the best combination possible, expect performance similar to an Intel HD 4000 and never below an Intel HD 3000. Thus, the card is only suited for modest 3D games and titles like BF4, AC4 and CoD: Ghosts are unplayable.
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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