GeForce GT 640M vs GeForce 840M

GeForce GT 640M
Memory: 2048Mb DDR3MOBILE
Release date: 22 Mar 2012
GeForce GT 640M
GeForce 840M
Memory: 1024Mb DDR3MOBILE
Release date: 12 Mar 2014
GeForce 840M

Summary

Synthetic performance index

  • GeForce GT 640M
    100%
  • GeForce 840M
    137%

Relative performance

Reasons to consider GeForce GT 640M

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Based on an outdated architecture (Nvidia Kepler), there are less performance optimizations for current games and applications.

Reasons to consider GeForce 840M

This is a much newer product, it might have better long term support.
Around 37% higher average synthetic performance.
Supports PhysX.
Supports G-Sync.
Supports ShadowPlay (allows game streaming/recording with minimum performance penalty).

GeForce 840M

HWBench recommends GeForce 840M

The GeForce 840M is the better performing card based on the synthetic benchmarks used (1 benchmarks).



Specifications

Core Configuration

GeForce GT 640MGeForce 840M
GPU NameGK107 (N13P-GS)vsGM108 (N15S-GT)
Fab Process28 nmvs28 nm
Die Size118 mm²vs0 mm²
Transistors1,270 millionvsunknown
Shaders384vs384
Compute Units2vs3
Core clock625 MHzvs1029 MHz
ROPs16vs8
TMUs32vs16

Memory Configuration

GeForce GT 640MGeForce 840M
Memory TypeDDR3vsDDR3
Bus Width128 bitvs64 bit
Memory Speed900 MHz
1800 MHz effective
vs1001 MHz
2002 MHz effective
Memory Size2048 Mbvs1024 Mb

Additional details

GeForce GT 640MGeForce 840M
TDP32 wattsvs33 watts
Release Date22 Mar 2012vs12 Mar 2014

Raw Performance comparison

Pixel Rate

  • GeForce GT 640M
    5.00 GP/s
  • GeForce 840M
    8.23 GP/s

GigaPixels - higher is better

Texel Rate

  • GeForce GT 640M
    20.00 GT/s
  • GeForce 840M
    16.46 GT/s

GigaTexels - higher is better

Memory bandwidth

  • GeForce GT 640M
    28.80 GB/s
  • GeForce 840M
    16.02 GB/s

GB/s - higher is better

Single precision performance

  • GeForce GT 640M
    480.00 GFLOPs
  • GeForce 840M
    790.30 GFLOPs

GFLOPs - higher is better


Synthetic benchmarks

3DMark 11

  • GeForce GT 640M
    1770
  • GeForce 840M
    2430

Points (higher is better)

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