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    GeForce 840M vs GeForce GT 640M LE

    If you are going to buy a new graphics card and are choosing between GeForce 840M and GeForce GT 640M LE, there are a couple of things to consider. Cards with more VRAM in general perform better and allow you to play on higher graphics settings. Size also makes a difference. A model with a large heatsink can occupy up to three expansion slots on a motherboard. Be sure you have enough room in your PC case. When comparing GPUs with different architectures, more processing cores and even higher TFLOPS will not always translate to better performance. To help you decide which GPU you need, we have measured frame rates in a number of popular games. For more on how the GeForce 840M stacks up against GeForce GT 640M LE, check out specs charts below.
    GeForce 840M Check Price
    GeForce GT 640M LE Check Price

    GeForce 840M and GeForce GT 640M LE are Laptop Graphics Cards

    Note: GeForce 840M and GeForce GT 640M LE 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 GeForce GT 640M LE here:

    GeForce 840M Laptops
    GeForce GT 640M LE Laptops

    Main Specs

      GeForce 840M GeForce GT 640M LE
    Power consumption (TDP) 33 Watt 20 Watt
    Interface PCIe 3.0 x8 PCIe 2.0 x16
    Memory type DDR3 DDR3\DDR5
    Maximum RAM amount 4 GB 2 GB
    Display Connectors No outputs No outputs
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    • GeForce 840M has 65% more power consumption, than GeForce GT 640M LE.
    • GeForce 840M is connected by PCIe 3.0 x8, and GeForce GT 640M LE uses PCIe 2.0 x16 interface.
    • GeForce 840M has 2 GB more memory, than GeForce GT 640M LE.
    • Both cards are used in Laptops.
    • GeForce 840M is build with Maxwell architecture, and GeForce GT 640M LE - with Fermi / Kepler.
    • GeForce 840M and GeForce GT 640M LE are manufactured by 28 nm process technology.
    • Memory clock speed of GeForce 840M is 200 MHz higher, than GeForce GT 640M LE.

    Game benchmarks

    high / 1080p 1−2 0−1
    ultra / 1080p 0−1 −
    QHD / 1440p 0−1 0−1
    low / 720p 12−14 1−2
    medium / 1080p 3−4 0−1
    The average gaming FPS of GeForce 840M in Assassin's Creed Odyssey is 1200% more, than GeForce GT 640M LE.

    Full Specs

      GeForce 840M GeForce GT 640M LE
    Architecture Maxwell Fermi / Kepler
    Code name N15S-GT N13P-LP
    Type Laptop Laptop
    Release date 12 March 2014 22 March 2012
    Pipelines 384 384
    Core clock speed 1029 MHz
    Boost Clock 1124 MHz
    Transistor count 585 million
    Manufacturing process technology 28 nm 28 nm
    Texture fill rate 17.98
    Floating-point performance 863.2 gflops 384.0 gflops
    Memory bus width 64 Bit 128bit
    Memory clock speed 2000 MHz 1800 - 4000 MHz
    Memory bandwidth 16.02 GB/s
    Shared memory - -
    DirectX 12 (11_0) 12 API
    Shader Model 5.1 5.1
    OpenGL 4.5 4.5
    OpenCL 1.2 1.1
    Vulkan 1.1.126 N/A
    CUDA + +
    CUDA cores Up to 384
    Bus support PCI Express 2.0, PCI Express 3.0 PCI Express 2.0, PCI Express 3.0
    HDMI +
    HDCP +
    Maximum VGA resolution Up to 2048x1536
    3D Blu-Ray +
    Bitcoin / BTC (SHA256) 92 Mh/s 14 Mh/s
    Laptop size medium sized medium sized
    Optimus + +
    GPU Boost 2.0
    GameWorks +
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