GeForce 940MX vs GeForce GTX 660

GeForce 940MX
Memory: 2048Mb GDDR5MOBILE
Release date: 28 Jun 2016
GeForce 940MX
GeForce GTX 660
Memory: 2048Mb GDDR5DESKTOP
Release date: 6 Sep 2012
GeForce GTX 660

Summary

Reasons to consider GeForce 940MX

117 watts lower power draw. This might be a strong point if your current power supply is not enough to handle the GeForce GTX 660 .
This is a much newer product, it might have better long term support.
Supports PhysX
Supports G-Sync
Supports ShadowPlay (allows game streaming/recording with minimum performance penalty)
Based on an outdated architecture (Nvidia Maxwell), there may be no performance optimizations for current games and applications

Reasons to consider GeForce GTX 660

Higher theoretical gaming performance, based on specifications.
Supports PhysX
Supports G-Sync
Supports ShadowPlay (allows game streaming/recording with minimum performance penalty)
Based on an outdated architecture (Nvidia Kepler), there are less performance optimizations for current games and applications

GeForce GTX 660

HWBench recommends GeForce GTX 660

Based on theoretical specifications.


Specifications

Core Configuration

GeForce 940MXGeForce GTX 660
GPU NameGM108 (N16S-GT1R)vsGK106 (GK106-400-A1)
Fab Process28 nmvs28 nm
Die Size0 mm²vs221 mm²
Transistorsunknownvs2,540 million
Shaders384vs960
Compute Units3vs5
Core clock795 MHzvs980 MHz
ROPs8vs24
TMUs24vs80

Memory Configuration

GeForce 940MXGeForce GTX 660
Memory TypeGDDR5vsGDDR5
Bus Width64 bitvs192 bit
Memory Speed1253 MHz
5012 MHz effective
vs1502 MHz
6008 MHz effective
Memory Size2048 Mbvs2048 Mb

Additional details

GeForce 940MXGeForce GTX 660
TDP23 wattsvs140 watts
Release Date28 Jun 2016vs6 Sep 2012

Raw Performance comparison

Pixel Rate

  • GeForce 940MX
    6.36 GP/s
  • GeForce GTX 660
    19.60 GP/s

GigaPixels - higher is better

Texel Rate

  • GeForce 940MX
    19.08 GT/s
  • GeForce GTX 660
    78.40 GT/s

GigaTexels - higher is better

Memory bandwidth

  • GeForce 940MX
    40.10 GB/s
  • GeForce GTX 660
    144.00 GB/s

GB/s - higher is better

Single precision performance

  • GeForce 940MX
    610.60 GFLOPs
  • GeForce GTX 660
    1882.00 GFLOPs

GFLOPs - higher is better