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    GeForce GT 640M vs Maxwell GPU Surface Book 940M GDDR5

    If you are going to buy a new graphics card and are choosing between GeForce GT 640M and Maxwell GPU Surface Book 940M GDDR5, 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 GT 640M stacks up against Maxwell GPU Surface Book 940M GDDR5, check out specs charts below.
    GeForce GT 640M Check Price
    Maxwell GPU Surface Book 940M GDDR5 Check Price

    GeForce GT 640M and Maxwell GPU Surface Book 940M GDDR5 are Laptop Graphics Cards

    Note: GeForce GT 640M and Maxwell GPU Surface Book 940M GDDR5 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 GT 640M or Maxwell GPU Surface Book 940M GDDR5 here:

    GeForce GT 640M Laptops
    Maxwell GPU Surface Book 940M GDDR5 Laptops

    Main Specs

      GeForce GT 640M Maxwell GPU Surface Book 940M GDDR5
    Power consumption (TDP) 32 Watt
    Interface PCIe 3.0 x16
    Memory type DDR3\GDDR5 GDDR5
    Maximum RAM amount 2 GB 1 GB
    Display Connectors No outputs
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    • GeForce GT 640M has 1 GB more memory, than Maxwell GPU Surface Book 940M GDDR5.
    • Both cards are used in Laptops.
    • GeForce GT 640M is build with Kepler architecture, and Maxwell GPU Surface Book 940M GDDR5 - with Maxwell.
    • GeForce GT 640M and Maxwell GPU Surface Book 940M GDDR5 are manufactured by 28 nm process technology.
    • Memory clock speed of Maxwell GPU Surface Book 940M GDDR5 is 3212 MHz higher, than GeForce GT 640M.

    Game benchmarks

    high / 1080p 0−1 9−10
    ultra / 1080p 0−1 5−6
    QHD / 1440p 0−1 0−1
    low / 720p 10−12 21−24
    medium / 1080p 2−3 12−14
    The average gaming FPS of Maxwell GPU Surface Book 940M GDDR5 in Assassin's Creed Odyssey is 183% more, than GeForce GT 640M.

    Full Specs

      GeForce GT 640M Maxwell GPU Surface Book 940M GDDR5
    Architecture Kepler Maxwell
    Code name N13P-GS Surface Book
    Type Laptop Laptop
    Release date 22 March 2012 1 October 2015
    Pipelines 384 384
    Core clock speed 954 MHz
    Boost Clock 645 MHz 993 MHz
    Transistor count 1,270 million
    Manufacturing process technology 28 nm 28 nm
    Floating-point performance 480.0 gflops
    Memory bus width 128bit 64 Bit
    Memory clock speed 1800 - 4000 MHz 5012 MHz
    Shared memory - -
    DirectX 12 API DirectX 12 (FL 11_0), Shader 5.0
    Shader Model 5.1
    OpenGL 4.5
    OpenCL 1.1
    Vulkan 1.1.126
    CUDA + +
    CUDA cores 384
    Bus support PCI Express 2.0, PCI Express 3.0
    HDMI +
    HDCP +
    Maximum VGA resolution Up to 2048x1536
    3D Blu-Ray +
    Bitcoin / BTC (SHA256) 18 Mh/s
    Laptop size medium sized
    Optimus + +
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