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    GeForce 840M vs Mobility Radeon HD 3870 X2

    When choosing between GeForce 840M and Mobility Radeon HD 3870 X2, it is worth examining the specifications of the models in detail. Do they meet the recommended requirements of modern games and software? Storage capacity, form factor, TDP, available ports, warranty and manufacturer support are all important. For example, the size of a PC case can limit the maximum thickness and length of the card. Often, instead of the factory overclocked card and RGB backlight, it is better to choose a reference model with a more efficient GPU. And make sure that your current power supply unit has the correct connection pins (using adapters is not recommended). This GPUs compare tool is meant to help you to choose the best graphics card for your build. Let's find out the difference between GeForce 840M and Mobility Radeon HD 3870 X2.
    GeForce 840M Check Price
    Mobility Radeon HD 3870 X2 Check Price

    GeForce 840M and Mobility Radeon HD 3870 X2 are Laptop Graphics Cards

    Note: GeForce 840M and Mobility Radeon HD 3870 X2 are only used in laptop graphics. They have lower GPU clock speed compared to the desktop variant, which results in lower power consumption, but also 10-30% lower gaming performance. Check available laptop models with GeForce 840M or Mobility Radeon HD 3870 X2 here:

    GeForce 840M Laptops
    Mobility Radeon HD 3870 X2 Laptops

    Main Specs

      GeForce 840M Mobility Radeon HD 3870 X2
    Power consumption (TDP) 33 Watt 110 Watt
    Interface PCIe 3.0 x8 PCIe 2.0 x16
    Memory type DDR3 GDDR3
    Maximum RAM amount 4 GB 512 MB
    Display Connectors No outputs No outputs
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    • Mobility Radeon HD 3870 X2 has 233% more power consumption, than GeForce 840M.
    • GeForce 840M is connected by PCIe 3.0 x8, and Mobility Radeon HD 3870 X2 uses PCIe 2.0 x16 interface.
    • Mobility Radeon HD 3870 X2 has 508 GB more memory, than GeForce 840M.
    • Both cards are used in Laptops.
    • GeForce 840M is build with Maxwell architecture, and Mobility Radeon HD 3870 X2 - with RV6xx.
    • Core clock speed of GeForce 840M is 369 MHz higher, than Mobility Radeon HD 3870 X2.
    • GeForce 840M is manufactured by 28 nm process technology, and Mobility Radeon HD 3870 X2 - by 55 nm process technology.
    • Memory clock speed of GeForce 840M is 1150 MHz higher, than Mobility Radeon HD 3870 X2.

    Game benchmarks

    high / 1080p 1−2 6−7
    ultra / 1080p 0−1 4−5
    QHD / 1440p 0−1 0−1
    low / 720p 12−14 16−18
    medium / 1080p 3−4 8−9
    The average gaming FPS of Mobility Radeon HD 3870 X2 in Assassin's Creed Odyssey is 66% more, than GeForce 840M.

    Full Specs

      GeForce 840M Mobility Radeon HD 3870 X2
    Architecture Maxwell RV6xx
    Code name N15S-GT M88-XT CF
    Type Laptop Laptop
    Release date 12 March 2014 1 September 2008
    Pipelines 384 640
    Core clock speed 1029 MHz 660 MHz
    Boost Clock 1124 MHz
    Transistor count 666 million
    Manufacturing process technology 28 nm 55 nm
    Texture fill rate 17.98 10.56
    Floating-point performance 863.2 gflops 2x 422.4 gflops
    Memory bus width 64 Bit 256 Bit
    Memory clock speed 2000 MHz 850 MHz
    Memory bandwidth 16.02 GB/s 54.4 GB/s
    Shared memory - -
    DirectX 12 (11_0) 10.1 (10_1)
    Shader Model 5.1 4.1
    OpenGL 4.5 3.3
    OpenCL 1.2 N/A
    Vulkan 1.1.126 N/A
    CUDA +
    Bus support PCI Express 2.0, PCI Express 3.0
    Bitcoin / BTC (SHA256) 92 Mh/s
    Laptop size medium sized large
    Optimus +
    GPU Boost 2.0
    GameWorks +
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