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Gaming Performance Comparison

Recommended System Requirements
Game GeForce 840M 2GB Radeon HD 6490M
Cyberpunk 2077 559% 1990%
Watch Dogs Legion 541% 1934%
Assassins Creed: Valhalla 508% 1828%
Call of Duty: Black Ops Cold War 488% 1766%
FIFA 21 235% 963%
Genshin Impact 565% 2008%
Microsoft Flight Simulator 488% 1766%
eFootball PES 2021 235% 963%
Ghostrunner 488% 1766%
Horizon: Zero Dawn 529% 1896%

In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce 840M 2GB are massively better than the AMD Radeon HD 6490M.

The GeForce 840M 2GB has a 279 MHz higher core clock speed and 16 more Texture Mapping Units than the Radeon HD 6490M. This results in the GeForce 840M 2GB providing 18.7 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 279 MHz higher core clock speed and 4 more Render Output Units than the Radeon HD 6490M. 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 Radeon HD 6490M, 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 Radeon HD 6490M when running the latest games.

The GeForce 840M 2GB has 1536 MB more video memory than the Radeon HD 6490M, so is likely to be much better at displaying game textures at higher resolutions. However, the overall memory performance is about the same.

The Radeon HD 6490M has 9.6 GB/sec greater memory bandwidth than the GeForce 840M 2GB, which means that the memory performance of the Radeon HD 6490M is marginally better than the GeForce 840M 2GB.

The GeForce 840M 2GB has 384 Shader Processing Units and the Radeon HD 6490M has 160. However, the actual shader performance of the GeForce 840M 2GB is 583 and the actual shader performance of the Radeon HD 6490M is 60. The GeForce 840M 2GB having 523 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 6490M.

The GeForce 840M 2GB transistor size technology is 12 nm (nanometers) smaller than the Radeon HD 6490M. This means that the GeForce 840M 2GB is expected to run slightly cooler and achieve higher clock frequencies than the Radeon HD 6490M.

The GeForce 840M 2GB requires 33 Watts to run and the Radeon HD 6490M requires 14 Watts. The GeForce 840M 2GB requires 19 Watts more than the Radeon HD 6490M 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 6490M.

Game FPS Benchmarks On Ultra

GPU Architecture

Core Speed1029 MHzvs750 MHz
Boost Clock1124 MHzvs-
ArchitectureMaxwell GM108Terascale 2 Seymour XTX
OC Potential Poor vs Poor
Driver Support Great vs Poor
Release Date12 Mar 2014vs04 Jan 2011
GPU LinkGD LinkGD Link

Resolution Performance

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GPU Memory

Memory2048 MBvs512 MB
Memory Speed1001 MHzvs800 MHz
Memory Bus64 Bitvs64 Bit
Memory TypeDDR3vsGDDR5
Memory Bandwidth16GB/secvs25.6GB/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%

GPU Display

Shader Processing Units384vs160
Actual Shader Performance28%vs3%
Texture Mapping Units24vs8
Texture Rate24.7 GTexel/svs6 GTexel/s
Render Output Units8vs4
Pixel Rate8.2 GPixel/svs3 GPixel/s

GPU Outputs

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

GPU Power Requirements

Max Power33 Wattsvs14 Watts
Recommended PSU--

GPU Features

Shader Model5.0vs5.0
Open GL4.5vs4.3
Open CL-vs-
Notebook GPUyesyes

GPU Supporting Hardware

Recommended ProcessorIntel Core i3-4100M 2.5GHzvsIntel Core i3-M350 2.26GHz
Recommended RAM4 GBvs4 GB
Maximum Recommended Gaming Resolution1366x768vs1366x768

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.

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 6490M is an entry-level GPU based on the 40nm Terrascale 2 architecture.
It's based on the Caicos Core (therefore related to Radeon HD 6450) and offers 160 Shader Processing Units, 8 TMUs and 4 ROPs on a 64-bit memory interface of fast GDDR5. Its central clock runs at up to 750MHz (800MHz if paired with DDR3) and the memory clock operates at 800MHz.
Despite being higher clocked than desktop Radeon HD 6450, it's expected to offer the same performance due to lower driver support.
Using a 720p resolution, almost all of today's games are only playable at low settings but with very fluent frame rates (40+).

Note 1: Radeon HD 6490M was later (2012) renamed and released as Radeon HD 7470M.
Note 2: There is also a DDR3 version of this card that has even lower bandwidth but comes higher clocked. Still, it's expected to perform considerably worse.
Recommended CPU
Possible GPU Upgrades
GPU Variants