Select any two GPUs for comparison

Gaming Performance Comparison

Recommended System Requirements
Game GeForce 840M 2GB Radeon HD 7660G + HD 7670M Dual
Cyberpunk 2077 559% 601%
Assassins Creed: Valhalla 508% 547%
Watch Dogs Legion 541% 582%
Genshin Impact 565% 607%
FIFA 21 235% 257%
Call of Duty: Black Ops Cold War 576% 620%
eFootball PES 2021 235% 257%
Microsoft Flight Simulator 488% 526%
Marvel's Avengers 529% 570%
Mafia: Definitive Edition 853% 914%

In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce 840M 2GB are very slightly better than the AMD Radeon HD 7660G + HD 7670M Dual.

The GeForce 840M 2GB was released over a year more recently than the HD 7660G, 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 HD 7660G.

The GeForce 840M 2GB has 2048 MB video memory, but the HD 7660G does not have an entry, so the two GPUs cannot be reliably compared in this area.

The GeForce 840M 2GB has 384 Shader Processing Units and the Radeon HD 7660G + HD 7670M Dual has 862. However, the actual shader performance of the GeForce 840M 2GB is 583 and the actual shader performance of the HD 7660G is 590. The HD 7660G having 7 better shader performance is not particularly notable, as altogether the GeForce 840M 2GB performs better when taking into account other relevant data.

The GeForce 840M 2GB requires 33 Watts to run but there is no entry for the Radeon HD 7660G + HD 7670M Dual.

Game FPS Benchmarks On Ultra

GPU Architecture

Core Speed1029 MHzvs685 MHz
Boost Clock1124 MHzvs-
ArchitectureMaxwell GM108Terascale 2
OC Potential Poor vs None
Driver Support Great vs -
Release Date12 Mar 2014vs01 May 2012
GPU LinkGD LinkGD Link

Resolution Performance

green tick vs -
green tick vs -
green tick vs -
green tick vs -
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GPU Memory

Memory2048 MBvs-
Memory Speed1001 MHzvs900 MHz
Memory Bus64 Bitvs128 Bit
Memory TypeDDR3vsDDR3
Memory Bandwidth16GB/secvs28.8GB/sec
L2 Cache 1024 KB green tick vs -
Delta Color Compression no vs no
Memory Performance 0% green tick vs green tick 0%

GPU Display

Shader Processing Units384vs862
Actual Shader Performance28%vs28%
Texture Mapping Units24vs-
Texture Rate24.7 GTexel/svs-
Render Output Units8vs-
Pixel Rate8.2 GPixel/svs-

GPU Outputs

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

GPU Power Requirements

Max Power33 Watts-
Recommended PSU--

GPU Features

Shader Model5.0vs5.0
Open GL4.5vs4.2
Open CL-vs-
Notebook GPUyesyes

GPU Supporting Hardware

Recommended ProcessorIntel Core i3-4100M 2.5GHz-
Recommended RAM4 GB-
Maximum Recommended Gaming Resolution1366x768-

Gaming Performance Value

Battlefield 4vs
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.

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.

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.

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.

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.

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.
Radeon HD 7660G + HD 7670M Dual is a combination of a Radeon 7660G (integrated graphics) with a Radeon HD 7670M (dedicated).
This combination is called Asymmetric CrossFire and can also lead to Micro Stuttering.
Unfortunately, benchmarks indicate the performance is,at times, worse than a single Radeon HD 7670M performing by itself. This might be due to poor driver support.
Recommended CPU
Possible GPU Upgrades
GPU Variants