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    GeForce GT 645M vs GeForce GTX 660M

    When comparing GeForce GT 645M and GeForce GTX 660M, we look primarily at benchmarks and game tests. But it is not only about the numbers. Often you can find third-party models with higher clock speeds, better cooling, or a customizable RGB lighting. Not all of them will have all the features you need. Another thing to consider is the port selection. Most graphics cards have at least one DisplayPort and HDMI interface, but some monitors require DVI. Before you buy, check the TDP of the graphics card - this characteristic will help you estimate the consumption of the graphics card. You may even have to upgrade your PSU to meet its requirements. An important factor when choosing between GeForce GT 645M and GeForce GTX 660M is the price. Does the additional cost justify the performance hit? Our comparison should help you make the right decision.
    GeForce GT 645M Check Price
    GeForce GTX 660M Check Price

    GeForce GT 645M and GeForce GTX 660M are Laptop Graphics Cards

    Note: GeForce GT 645M and GeForce GTX 660M 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 660M here:

    GeForce GT 645M Laptops
    GeForce GTX 660M Laptops

    Main Specs

      GeForce GT 645M GeForce GTX 660M
    Power consumption (TDP) 32 Watt 50 Watt
    Interface PCIe 3.0 x16 MXM-B (3.0)
    Memory type DDR3\GDDR5 GDDR5
    Maximum RAM amount 2 GB 2 GB
    Display Connectors No outputs No outputs
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    • GeForce GTX 660M has 56% more power consumption, than GeForce GT 645M.
    • GeForce GT 645M is connected by PCIe 3.0 x16, and GeForce GTX 660M uses MXM-B (3.0) interface.
    • GeForce GT 645M and GeForce GTX 660M have maximum RAM of 2 GB.
    • Both cards are used in Laptops.
    • GeForce GT 645M and GeForce GTX 660M are build with Kepler architecture.
    • GeForce GT 645M and GeForce GTX 660M are manufactured by 28 nm process technology.
    • Memory clock speed of GeForce GTX 660M is 200 MHz higher, than GeForce GT 645M.

    Game benchmarks

    high / 1080p 1−2 6−7
    ultra / 1080p 0−1 4−5
    QHD / 1440p 0−1 0−1
    low / 720p 12−14 16−18
    medium / 1080p 2−3 8−9
    The average gaming FPS of GeForce GTX 660M in Assassin's Creed Odyssey is 100% more, than GeForce GT 645M.

    Full Specs

      GeForce GT 645M GeForce GTX 660M
    Architecture Kepler Kepler
    Code name N13P-GS N13E-GE
    Type Laptop Laptop
    Release date 22 March 2012 22 March 2012
    Pipelines 384 384
    Core clock speed 835 MHz
    Boost Clock 950 MHz
    Transistor count 1,270 million 1,270 million
    Manufacturing process technology 28 nm 28 nm
    Texture fill rate 22.7 billion/sec 30.4 billion/sec
    Floating-point performance 544.5 gflops 729.6 gflops
    Memory bus width 128bit 128bit
    Memory clock speed 1800 MHz 2000 MHz
    Memory bandwidth 64.0 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 384 384
    Bus support PCI Express 2.0, PCI Express 3.0 PCI Express 2.0, PCI Express 3.0
    SLI options +
    HDMI + +
    HDCP + +
    Maximum VGA resolution Up to 2048x1536 Up to 2048x1536
    3D Blu-Ray +
    Bitcoin / BTC (SHA256) 19 Mh/s 36 Mh/s
    Laptop size medium sized large
    Optimus + +
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