HWBench.com

    GeForce 840M vs Radeon HD 8790M

    GeForce 840M
    Memory: 1024Mb DDR3MOBILE
    Release date: 12 Mar 2014
    GeForce 840M
    Radeon HD 8790M
    Memory: 2048Mb GDDR5MOBILE
    Release date: 1 Apr 2013
    Radeon HD 8790M

    Summary

    Synthetic performance index

    • GeForce 840M
      114%
    • Radeon HD 8790M
      100%

    Relative performance

    Reasons to consider GeForce 840M

    This is a much newer product, it might have better long term support.
    Around 14% 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    Based on an outdated architecture (Nvidia Maxwell), there may be no performance optimizations for current games and applications

    Reasons to consider Radeon HD 8790M

    Supports Direct3D 12 Async Compute
    Supports ReLive (allows game streaming/recording with minimum performance penalty)
    Supports Mantle
    Based on an outdated architecture (AMD GCN), there may be no performance optimizations for current games and applications
    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 840MRadeon HD 8790M
    GPU NameGM108 (N15S-GT)vsMars (Mars XTX)
    Fab Process28 nmvs28 nm
    Die Size0 mm²vs77 mm²
    Transistorsunknownvs1,040 million
    Shaders384vs384
    Compute Units3vs6
    Core clock1029 MHzvs850 MHz
    ROPs8vs8
    TMUs16vs24

    Memory Configuration

    GeForce 840MRadeon HD 8790M
    Memory TypeDDR3vsGDDR5
    Bus Width64 bitvs128 bit
    Memory Speed1001 MHz
    2002 MHz effective    		vs1000 MHz
    4000 MHz effective
    Memory Size1024 Mbvs2048 Mb

    Additional details

    GeForce 840MRadeon HD 8790M
    TDP33 wattsvs0 watts
    Release Date12 Mar 2014vs1 Apr 2013

    Raw Performance comparison

    Pixel Rate

    • GeForce 840M
      8.23 GP/s
    • Radeon HD 8790M
      7.20 GP/s

    GigaPixels - higher is better

    Texel Rate

    • GeForce 840M
      16.46 GT/s
    • Radeon HD 8790M
      21.60 GT/s

    GigaTexels - higher is better

    Memory bandwidth

    • GeForce 840M
      16.02 GB/s
    • Radeon HD 8790M
      64.00 GB/s

    GB/s - higher is better

    Single precision performance

    • GeForce 840M
      790.30 GFLOPs
    • Radeon HD 8790M
      691.20 GFLOPs

    GFLOPs - higher is better

    Synthetic benchmarks

    3DMark 11

    • GeForce 840M
      2430
    • Radeon HD 8790M
      2130

    Points (higher is better)

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