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    GeForce GT 645M vs GeForce GTX 680

    In this comparison between GeForce GT 645M and GeForce GTX 680 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 680 will be their preference. Study the comparison tables below and make your choice.
    GeForce GT 645M Check Price
    GeForce GTX 680 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 GT 645M GeForce GTX 680
    Power consumption (TDP) 32 Watt 195 Watt
    Interface PCIe 3.0 x16 PCIe 3.0 x16
    Supplementary power connectors Two 6-pin
    Memory type DDR3\GDDR5 GDDR5
    Maximum RAM amount 2 GB 2048 MB
    Display Connectors No outputs 2x DVI, 1x HDMI, 1x DisplayPort
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    • GeForce GTX 680 has 509% more power consumption, than GeForce GT 645M.
    • Both video cards are using PCIe 3.0 x16 interface connection to a motherboard.
    • GeForce GTX 680 has 2046 GB more memory, than GeForce GT 645M.
    • GeForce GT 645M is used in Laptops, and GeForce GTX 680 - in Desktops.
    • GeForce GT 645M and GeForce GTX 680 are build with Kepler architecture.
    • GeForce GT 645M and GeForce GTX 680 are manufactured by 28 nm process technology.
    • Memory clock speed of GeForce GTX 680 is 4200 MHz higher, than GeForce GT 645M.

    Game benchmarks

    high / 1080p 1−2 35−40
    ultra / 1080p 0−1 21−24
    QHD / 1440p 0−1 16−18
    4K / 2160p − 10−11
    low / 720p 12−14 60−65
    medium / 1080p 2−3 40−45
    The average gaming FPS of GeForce GTX 680 in Assassin's Creed Odyssey is 840% more, than GeForce GT 645M.

    Full Specs

      GeForce GT 645M GeForce GTX 680
    Architecture Kepler Kepler
    Code name N13P-GS GK104
    Type Laptop Desktop
    Release date 22 March 2012 22 March 2012
    Pipelines 384 1536
    Core clock speed 1006 MHz
    Boost Clock 1058 MHz
    Transistor count 1,270 million 3,540 million
    Manufacturing process technology 28 nm 28 nm
    Texture fill rate 22.7 billion/sec 128.8 billion/sec
    Floating-point performance 544.5 gflops 3,090.4 gflops
    Length 10.0" (25.4 cm)
    Memory bus width 128bit 256-bit GDDR5
    Memory clock speed 1800 MHz 6000 MHz
    Memory bandwidth 192.2 GB/s
    Shared memory - -
    DirectX 12 API 12 (11_0)
    Shader Model 5.1 5.1
    OpenGL 4.5 4.2
    OpenCL 1.1 1.2
    Vulkan 1.1.126 1.1.126
    CUDA + +
    CUDA cores 384 1536
    Bus support PCI Express 2.0, PCI Express 3.0 PCI Express 3.0
    Height 4.376" (11.1 cm)
    SLI options +
    Multi monitor support 4 displays
    HDMI + +
    HDCP + +
    Maximum VGA resolution Up to 2048x1536 2048x1536
    Audio input for HDMI Internal
    3D Blu-Ray +
    Bitcoin / BTC (SHA256) 19 Mh/s 121 Mh/s
    Laptop size medium sized
    Optimus +
    Ethereum / ETH (DaggerHashimoto) 15 Mh/s
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