HWBench.com

    GeForce GTX 660M vs GeForce 840M

    GeForce GTX 660M
    Memory: 1024Mb GDDR5MOBILE
    Release date: 22 Mar 2012
    GeForce GTX 660M
    GeForce 840M
    Memory: 1024Mb DDR3MOBILE
    Release date: 12 Mar 2014
    GeForce 840M

    Summary

    Synthetic performance index

    • GeForce GTX 660M
      105%
    • GeForce 840M
      100%

    Relative performance

    Reasons to consider GeForce GTX 660M

    Around 5% higher average synthetic performance.
    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    Based on an outdated architecture (Nvidia Kepler), there are less performance optimizations for current games and applications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.
    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    Based on an outdated architecture (Nvidia Maxwell), there may be no performance optimizations for current games and applications
    GeForce GTX 660M

    HWBench recommends GeForce GTX 660M

    The GeForce GTX 660M is the better performing card based on the synthetic benchmarks used (1 benchmarks).

    Specifications

    Core Configuration

    GeForce GTX 660MGeForce 840M
    GPU NameGK107 (N13E-GE-A2)vsGM108 (N15S-GT)
    Fab Process28 nmvs28 nm
    Die Size118 mm²vs0 mm²
    Transistors1,270 millionvsunknown
    Shaders384vs384
    Compute Units2vs3
    Core clock835 MHzvs1029 MHz
    ROPs16vs8
    TMUs32vs16

    Memory Configuration

    GeForce GTX 660MGeForce 840M
    Memory TypeGDDR5vsDDR3
    Bus Width128 bitvs64 bit
    Memory Speed1000 MHz
    4000 MHz effective    		vs1001 MHz
    2002 MHz effective
    Memory Size1024 Mbvs1024 Mb

    Additional details

    GeForce GTX 660MGeForce 840M
    TDP50 wattsvs33 watts
    Release Date22 Mar 2012vs12 Mar 2014

    Raw Performance comparison

    Pixel Rate

    • GeForce GTX 660M
      6.68 GP/s
    • GeForce 840M
      8.23 GP/s

    GigaPixels - higher is better

    Texel Rate

    • GeForce GTX 660M
      26.72 GT/s
    • GeForce 840M
      16.46 GT/s

    GigaTexels - higher is better

    Memory bandwidth

    • GeForce GTX 660M
      64.00 GB/s
    • GeForce 840M
      16.02 GB/s

    GB/s - higher is better

    Single precision performance

    • GeForce GTX 660M
      641.30 GFLOPs
    • GeForce 840M
      790.30 GFLOPs

    GFLOPs - higher is better

    Synthetic benchmarks

    3DMark 11

    • GeForce GTX 660M
      2570
    • GeForce 840M
      2430

    Points (higher is better)

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