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    GeForce 840A vs GeForce GT 645M

    Find out if it is worth upgrading your current GPU setup by comparing GeForce 840A and GeForce GT 645M. Here you can take a closer look at graphics cards specs, such as core clock speed, memory type and size, display connectors, etc. The price, overall benchmark and gaming performances are usually defining factors when it comes to choosing between GeForce 840A and GeForce GT 645M. Make sure that the graphics card has compatible dimensions and will properly fit in your new or current computer case. Also these graphics cards may have different system power recommendations, so take that into consideration and upgrade your PSU if necessary.
    GeForce 840A
    GeForce GT 645M Check Price

    GeForce GT 645M is a Laptop Graphics Card

    Note: GeForce GT 645M is only used in laptop graphics. It has 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 645M here:

    GeForce GT 645M Laptops

    Main Specs

      GeForce 840A GeForce GT 645M
    Power consumption (TDP) 33 Watt 32 Watt
    Interface PCIe 3.0 x8 PCIe 3.0 x16
    Memory type DDR3 DDR3\GDDR5
    Maximum RAM amount 2 GB 2 GB
    Display Connectors No outputs No outputs
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    • GeForce 840A has 3% more power consumption, than GeForce GT 645M.
    • GeForce 840A is connected by PCIe 3.0 x8, and GeForce GT 645M uses PCIe 3.0 x16 interface.
    • GeForce 840A and GeForce GT 645M have maximum RAM of 2 GB.
    • GeForce 840A is used in Desktops, and GeForce GT 645M - in Laptops.
    • GeForce 840A is build with Maxwell architecture, and GeForce GT 645M - with Kepler.
    • GeForce 840A and GeForce GT 645M are manufactured by 28 nm process technology.
    • Memory clock speed of GeForce 840A is 202 MHz higher, than GeForce GT 645M.

    Game benchmarks

    high / 1080p 3−4 1−2
    ultra / 1080p 2−3 0−1
    QHD / 1440p 0−1 0−1
    low / 720p 14−16 12−14
    medium / 1080p 5−6 2−3
    The average gaming FPS of GeForce 840A in Assassin's Creed Odyssey is 60% more, than GeForce GT 645M.

    Full Specs

      GeForce 840A GeForce GT 645M
    Architecture Maxwell Kepler
    Code name GM108 N13P-GS
    Type Desktop Laptop
    Release date 17 March 2014 22 March 2012
    Pipelines 384 384
    Core clock speed 1029 MHz
    Boost Clock 1124 MHz
    Transistor count 1,270 million
    Manufacturing process technology 28 nm 28 nm
    Texture fill rate 17.98 22.7 billion/sec
    Floating-point performance 863.2 gflops 544.5 gflops
    Memory bus width 64 Bit 128bit
    Memory clock speed 2002 MHz 1800 MHz
    Memory bandwidth 16.02 GB/s
    Shared memory -
    DirectX 12 (11_0) 12 API
    Shader Model 5.1 5.1
    OpenGL 4.6 4.5
    OpenCL 1.2 1.1
    Vulkan 1.1.126 1.1.126
    CUDA 5.0 +
    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) 19 Mh/s
    Laptop size medium sized
    Optimus +
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