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    GeForce 940MX vs GeForce GT 640M

    If you are going to buy a new graphics card and are choosing between GeForce 940MX and GeForce GT 640M, 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 940MX stacks up against GeForce GT 640M, check out specs charts below.
    GeForce 940MX Check Price
    GeForce GT 640M Check Price

    GeForce 940MX and GeForce GT 640M are Laptop Graphics Cards

    Note: GeForce 940MX and GeForce GT 640M 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 940MX or GeForce GT 640M here:

    GeForce 940MX Laptops
    GeForce GT 640M Laptops

    Main Specs

      GeForce 940MX GeForce GT 640M
    Power consumption (TDP) 23 Watt 32 Watt
    Interface PCIe 3.0 x8 PCIe 3.0 x16
    Supplementary power connectors None
    Memory type DDR3, GDDR5 DDR3\GDDR5
    Maximum RAM amount 4 GB 2 GB
    Display Connectors No outputs No outputs
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    • GeForce GT 640M has 39% more power consumption, than GeForce 940MX.
    • GeForce 940MX is connected by PCIe 3.0 x8, and GeForce GT 640M uses PCIe 3.0 x16 interface.
    • GeForce 940MX has 2 GB more memory, than GeForce GT 640M.
    • Both cards are used in Laptops.
    • GeForce 940MX is build with Maxwell architecture, and GeForce GT 640M - with Kepler.
    • GeForce 940MX and GeForce GT 640M are manufactured by 28 nm process technology.
    • Memory clock speed of GeForce 940MX is 2200 MHz higher, than GeForce GT 640M.

    Game benchmarks

    high / 1080p 7−8 0−1
    ultra / 1080p 4−5 0−1
    QHD / 1440p 0−1 0−1
    low / 720p 16−18 10−12
    medium / 1080p 8−9 2−3
    The average gaming FPS of GeForce 940MX in Assassin's Creed Odyssey is 100% more, than GeForce GT 640M.

    Full Specs

      GeForce 940MX GeForce GT 640M
    Architecture Maxwell Kepler
    Code name N16S-GTR-B/S N13P-GS
    Type Laptop Laptop
    Release date 10 March 2016 22 March 2012
    Pipelines 384 384
    Core clock speed 1122 MHz
    Boost Clock 1242 MHz 645 MHz
    Transistor count 1,870 million 1,270 million
    Manufacturing process technology 28 nm 28 nm
    Texture fill rate 23.83
    Floating-point performance 762.6 gflops 480.0 gflops
    Memory bus width 64 Bit 128bit
    Memory clock speed 4000 MHz 1800 - 4000 MHz
    Memory bandwidth 40.1 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 1.1.126
    CUDA + +
    CUDA cores 384
    Bus support 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) 102 Mh/s 18 Mh/s
    Laptop size medium sized medium sized
    Optimus + +
    GPU Boost 2.0
    GameWorks +
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