Select any two GPUs for comparison

Gaming Performance Comparison

Recommended System Requirements
Game GeForce GTX 660M Radeon HD 6490M
Halo: Reach 70% 534%
Cyberpunk 2077 635% 2643%
Red Dead Redemption 2 435% 1896%
Dragon Ball Z Kakarot 230% 1131%
Call of Duty: Modern Warfare 435% 1896%
Doom Eternal 360% 1616%
Microsoft Flight Simulator 635% 2643%
Grand Theft Auto VI 718% 2950%
FIFA 20 185% 963%
Need For Speed Heat 435% 1896%

In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce GTX 660M are massively better than the AMD Radeon HD 6490M.

The GeForce GTX 660M has a 85 MHz higher core clock speed and 24 more Texture Mapping Units than the Radeon HD 6490M. This results in the GeForce GTX 660M providing 20.7 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 GTX 660M has a 85 MHz higher core clock speed and 12 more Render Output Units than the Radeon HD 6490M. This results in the GeForce GTX 660M providing 10.4 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 GTX 660M was released over a year more recently than the Radeon HD 6490M, and so the GeForce GTX 660M is likely to have better driver support, meaning it will be more optimized for running the latest games when compared to the Radeon HD 6490M.

The GeForce GTX 660M 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. This is supported by the fact that the GeForce GTX 660M also has superior memory performance overall.

The GeForce GTX 660M has 38.4 GB/sec greater memory bandwidth than the Radeon HD 6490M, which means that the memory performance of the GeForce GTX 660M is noticeably better than the Radeon HD 6490M.

The GeForce GTX 660M has 384 Shader Processing Units and the Radeon HD 6490M has 160. However, the actual shader performance of the GeForce GTX 660M is 365 and the actual shader performance of the Radeon HD 6490M is 60. The GeForce GTX 660M having 305 better shader performance and an altogether better performance when taking into account other relevant data means that the GeForce GTX 660M delivers a significantly smoother and more efficient experience when processing graphical data than the Radeon HD 6490M.

The GeForce GTX 660M transistor size technology is 12 nm (nanometers) smaller than the Radeon HD 6490M. This means that the GeForce GTX 660M is expected to run slightly cooler and achieve higher clock frequencies than the Radeon HD 6490M.

The GeForce GTX 660M requires 50 Watts to run and the Radeon HD 6490M requires 14 Watts. The GeForce GTX 660M requires 36 Watts more than the Radeon HD 6490M to run. The difference is significant enough that the GeForce GTX 660M may have a slight adverse affect on your yearly electricity bills in comparison to the Radeon HD 6490M.

Game FPS Benchmarks On Ultra

GPU Architecture

Core Speed835 MHzvs750 MHz
Boost Clock950 MHzvs-
ArchitectureKepler GK107-N13E-GE-A2Terascale 2 Seymour XTX
OC Potential Poor vs Poor
Driver Support Good vs Poor
Release Date22 Mar 2012vs04 Jan 2011
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 MBvs512 MB
Memory Speed1000 MHzvs800 MHz
Memory Bus128 Bitvs64 Bit
Memory TypeGDDR5vsGDDR5
Memory Bandwidth64GB/secvs25.6GB/sec
L2 Cache 256 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 Performance18%vs3%
Texture Mapping Units32vs8
Texture Rate26.7 GTexel/svs6 GTexel/s
Render Output Units16vs4
Pixel Rate13.4 GPixel/svs3 GPixel/s

GPU Outputs

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

GPU Power Requirements

Max Power50 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 i5-3360M 2.8GHzvsIntel Core i3-M350 2.26GHz
Recommended RAM8 GBvs4 GB
Maximum Recommended Gaming Resolution1600x900vs1366x768

Gaming Performance Value

Battlefield 3vs
Crysis 3vs
Performance Value

GPU Mini Review

Mini ReviewOverview
GeForce GTX 660M is a Fast-Middle-Class Mobile Graphics Card based on the first revision of the Kepler Architecture.

The Kepler Architecture was NVIDIA's big step to power efficiency. Each Stream Multiprocessor (SMX) now hosts 192 Shader Processing Units - against the 48 of older Fermi Architecture, and has been redesigned being now clocked at the same speed of the Central Unit. This means they are more energy efficient and will consequently lead to cooler operating temperatures. However, it also means they are weaker. It can be said that one Fermi SMX is as fast as 2 Kepler SMXs.
Additionally, and not available in all GPUs, Kepler also introduced the Boost Clock Feature. The Boost Clock is an even higher Clock Speed activated when in gaming mode and becomes the effective speed of the GPU.

It equips a GPU Codenamed GK107-N13E-GE-A2 which has 2 Stream Multiprocessors activated and thus offers 384 Shader Processing Units, 32 TMUs and 16 ROPs. The Central Unit is initially clocked at 835MHz and goes up to 950MHz, in Turbo Mode.

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 no way benefits the GPU. The Memory Clock Operates at 1000MHz.

DirectX 11.0 Support (11.0 Hardware Default) and support for SLI, Kepler Boost, Optimus, CUDA, OpenCL, DirectCompute, 3D Vision Surround, PhysX, Realtime Raytracing and other technologies

Power Consumption
With a rated board TDP of 45W, it is suited for average sized laptops.

Gaming benchmarks indicate its performance is not too far from the desktop GeForce GTX 650.

System Suggestions
We recommend a decent processor (Intel Core i5 Mobile) and 8GB of RAM for a system with GeForce GTX 660M.
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