Select any two GPUs for comparison
VS

Gaming Performance Comparison

Recommended System Requirements
Game GeForce 840M 2GB Radeon HD 7870M
Cyberpunk 2077 559% 348%
Assassins Creed: Valhalla 508% 313%
Genshin Impact 565% 352%
FIFA 21 235% 128%
Watch Dogs Legion 541% 336%
eFootball PES 2021 235% 128%
Call of Duty: Black Ops Cold War 576% 360%
Microsoft Flight Simulator 488% 300%
Marvel's Avengers 529% 328%
Mafia: Definitive Edition 853% 548%

In terms of overall gaming performance, the graphical capabilities of the AMD Radeon HD 7870M are significantly better than the Nvidia GeForce 840M 2GB.

The GeForce 840M 2GB has a 229 MHz higher core clock speed than the Radeon HD 7870M, but the Radeon HD 7870M has 16 more Texture Mapping Units than the GeForce 840M 2GB. As a result, the Radeon HD 7870M exhibits a 7.3 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 229 MHz higher core clock speed than the Radeon HD 7870M, but the Radeon HD 7870M has 8 more Render Output Units than the GeForce 840M 2GB. As a result, the Radeon HD 7870M exhibits a 4.6 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 Radeon HD 7870M, 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 Radeon HD 7870M.

The GeForce 840M 2GB and the Radeon HD 7870M have the same amount of video memory, but are likely to provide slightly different experiences when displaying game textures at high resolutions.

The Radeon HD 7870M has 48 GB/sec greater memory bandwidth than the GeForce 840M 2GB, which means that the memory performance of the Radeon HD 7870M is noticeably better than the GeForce 840M 2GB.

The GeForce 840M 2GB has 384 Shader Processing Units and the Radeon HD 7870M has 640. However, the actual shader performance of the GeForce 840M 2GB is 583 and the actual shader performance of the Radeon HD 7870M is 435. The GeForce 840M 2GB having 148 better shader performance is not particularly notable, as altogether the Radeon HD 7870M performs better when taking into account other relevant data.

The GeForce 840M 2GB requires 33 Watts to run and the Radeon HD 7870M requires 45 Watts. The Radeon HD 7870M requires 12 Watts more than the GeForce 840M 2GB to run. The difference is not significant enough for the Radeon HD 7870M to have a noticeably larger impact on your yearly electricity bills than the GeForce 840M 2GB.

Game FPS Benchmarks On Ultra

GPU Architecture

Core Speed1029 MHzvs800 MHz
Boost Clock1124 MHzvs-
ArchitectureMaxwell GM108GCN 1.0 Heathrow XT
OC Potential Poor vs Fair
Driver Support Great vs Good
Release Date12 Mar 2014vs24 Apr 2012
GPU LinkGD LinkGD Link
Approved
Comparison

Resolution Performance

1366x768
7
vs green tick
8.6
1600x900
5.4
vs green tick
6.5
1920x1080
3.9
vs green tick
5
2560x1440
2.6
vs green tick
3.1
3840x2160
1.7
vs green tick
2.2

GPU Memory

Memory2048 MBvs2048 MB
Memory Speed1001 MHzvs1000 MHz
Memory Bus64 Bitvs128 Bit
Memory TypeDDR3vsGDDR5
Memory Bandwidth16GB/secvs64GB/sec
L2 Cache 1024 KB green tick vs 256 KB
Delta Color Compression no vs no
Memory Performance 0% green tick vs green tick 0%
Comparison

GPU Display

Shader Processing Units384vs640
Actual Shader Performance28%vs21%
Technology28nmvs28nm
Texture Mapping Units24vs40
Texture Rate24.7 GTexel/svs32 GTexel/s
Render Output Units8vs16
Pixel Rate8.2 GPixel/svs12.8 GPixel/s
Comparison

GPU Outputs

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

GPU Power Requirements

Max Power33 Wattsvs45 Watts
Recommended PSU--

GPU Features

DirectX12.0vs12.0
Shader Model5.0vs5.0
Open GL4.5vs4.4
Open CL-vs-
Notebook GPUyesyes
SLI/Crossfirenovsyes
Dedicatedyesvsyes
Comparison

GPU Supporting Hardware

Recommended ProcessorIntel Core i3-4100M 2.5GHzvsIntel Core i5-3360M 2.8GHz
Recommended RAM4 GBvs8 GB
Maximum Recommended Gaming Resolution1366x768vs1600x900

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
Radeon HD 7870M is a Performance Mobile Graphics Card based on the First revision of the GCN Architecture.

Architecture
The GCN Architecture succeeds the 40nm Terascale Architecture. In addition to being produced with a 28nm Technology, the GCN Architecture adds other Technologies that allow for energy efficiency. For example, ZeroCore Power, a long idle power saving technology, allows the Graphics Cards to shut down by itself when the Monitor is turned off.
GCN also adds Improved Anisotropic Filtering, DirectX 11 Tessellation and the Partially Resident Textures (PRT) Technology, which enables future games to utilize ultra-high resolution textures with the same performance as today's small and often repetitive textures.

GPU
It equips a GPU codenamed Heathrow XT which has 10 Compute Units activated and thus offers 640 Shader Processing Units, 40 TMUs and 16 ROPs. The Central Unit Operates at 800MHz.

Memory
The GPU accesses a 2GB frame buffer of fast GDDR5, through a 128-bit memory interface. The size of the frame buffer is exaggerated and in no way benefits the GPU. The memory clock operates at 1000MHz.

Features
DirectX 11.0 Support (11.0 Hardware Default) and support for Crossfire, PowerTune Technology, Eyefinity, App Acceleration, HD3D, ZeroCore Power and other technologies.

Power Consumption
With a rated board TDP of 45W, it is suited for 17" or larger laptops.

Performance
Gaming benchmarks put its on average with NVIDIA's GeForce GTX 670M.

System Suggestions
We recommend a Decent Processor (Intel Core i5 Mobile) and 8GB of RAM for a system with Radeon HD 7870M.
Recommended CPU
Possible GPU Upgrades
N/A
N/A
GPU Variants
-
-