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    GeForce GT 645M vs GeForce GTX 680M

    In this comparison between GeForce GT 645M and GeForce GTX 680M you will find out which graphics card performs better in today's games. Bear in mind that third-party versions may have more efficient cooling and higher clock speeds. This will increase cards' performance, though not by much. In addition to raw power you should also take into account the dimensions. Thicker models simply will not fit into a small mini-ITX case. The resolution of your monitor also affects the choice, since 4K gameplay requires a more powerful GPU. And don't overspend on the graphics card. Other parts of your build may also need to be upgraded, save some money for the CPU or power supply. For some people GeForce GT 645M will be the best choice, for others GeForce GTX 680M will be their preference. Study the comparison tables below and make your choice.
    GeForce GT 645M Check Price
    GeForce GTX 680M Check Price

    GeForce GT 645M and GeForce GTX 680M are Laptop Graphics Cards

    Note: GeForce GT 645M and GeForce GTX 680M 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 645M or GeForce GTX 680M here:

    GeForce GT 645M Laptops
    GeForce GTX 680M Laptops

    Main Specs

      GeForce GT 645M GeForce GTX 680M
    Power consumption (TDP) 32 Watt 100 Watt
    Interface PCIe 3.0 x16 MXM-B (3.0)
    Supplementary power connectors None
    Memory type DDR3\GDDR5 GDDR5
    Maximum RAM amount 2 GB 4 GB
    Display Connectors No outputs No outputs
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    • GeForce GTX 680M has 212% more power consumption, than GeForce GT 645M.
    • GeForce GT 645M is connected by PCIe 3.0 x16, and GeForce GTX 680M uses MXM-B (3.0) interface.
    • GeForce GTX 680M has 2 GB more memory, than GeForce GT 645M.
    • Both cards are used in Laptops.
    • GeForce GT 645M and GeForce GTX 680M are build with Kepler architecture.
    • GeForce GT 645M and GeForce GTX 680M are manufactured by 28 nm process technology.
    • Memory clock speed of GeForce GT 645M and GeForce GTX 680M is 1800 MHz.

    Game benchmarks

    high / 1080p 1−2 16−18
    ultra / 1080p 0−1 9−10
    QHD / 1440p 0−1 4−5
    4K / 2160p − 4−5
    low / 720p 12−14 30−35
    medium / 1080p 2−3 20−22
    The average gaming FPS of GeForce GTX 680M in Assassin's Creed Odyssey is 360% more, than GeForce GT 645M.

    Full Specs

      GeForce GT 645M GeForce GTX 680M
    Architecture Kepler Kepler
    Code name N13P-GS N13E-GTX
    Type Laptop Laptop
    Release date 22 March 2012 4 June 2012
    Pipelines 384 1344
    Core clock speed 720 MHz
    Boost Clock 758 MHz
    Transistor count 1,270 million 3,540 million
    Manufacturing process technology 28 nm 28 nm
    Texture fill rate 22.7 billion/sec 80.6 billion/sec
    Floating-point performance 544.5 gflops 2,038 gflops
    Memory bus width 128bit 256 Bit
    Memory clock speed 1800 MHz 1800 MHz
    Memory bandwidth 115.2 GB/s
    Shared memory - -
    DirectX 12 API 12 API
    Shader Model 5.1 5.1
    OpenGL 4.5 4.5
    OpenCL 1.1 1.1
    Vulkan 1.1.126 1.1.126
    CUDA + +
    CUDA cores 384 1344
    Bus support PCI Express 2.0, PCI Express 3.0 PCI Express 3.0
    SLI options +
    HDMI +
    HDCP +
    Maximum VGA resolution Up to 2048x1536
    3D Blu-Ray +
    Bitcoin / BTC (SHA256) 19 Mh/s 100 Mh/s
    Laptop size medium sized large
    Optimus + +
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