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    GeForce GT 645M vs GeForce GTX 660

    When comparing GeForce GT 645M and GeForce GTX 660, 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 660 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 660 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 660
    Power consumption (TDP) 32 Watt 140 Watt
    Interface PCIe 3.0 x16 PCIe 3.0 x16
    Supplementary power connectors One 6-pin
    Memory type DDR3\GDDR5 GDDR5
    Maximum RAM amount 2 GB 2 GB
    Display Connectors No outputs 2x DVI, 1x HDMI, 1x DisplayPort
      Check Price Check Price
    • GeForce GTX 660 has 337% more power consumption, than GeForce GT 645M.
    • Both video cards are using PCIe 3.0 x16 interface connection to a motherboard.
    • GeForce GT 645M and GeForce GTX 660 have maximum RAM of 2 GB.
    • GeForce GT 645M is used in Laptops, and GeForce GTX 660 - in Desktops.
    • GeForce GT 645M and GeForce GTX 660 are build with Kepler architecture.
    • GeForce GT 645M and GeForce GTX 660 are manufactured by 28 nm process technology.
    • Memory clock speed of GeForce GT 645M is 1794 MHz higher, than GeForce GTX 660.

    Game benchmarks

    high / 1080p 1−2 20−22
    ultra / 1080p 0−1 12−14
    QHD / 1440p 0−1 6−7
    4K / 2160p − 5−6
    low / 720p 12−14 40−45
    medium / 1080p 2−3 24−27
    The average gaming FPS of GeForce GTX 660 in Assassin's Creed Odyssey is 480% more, than GeForce GT 645M.

    Full Specs

      GeForce GT 645M GeForce GTX 660
    Architecture Kepler Kepler
    Code name N13P-GS GK106
    Type Laptop Desktop
    Release date 22 March 2012 6 September 2012
    Pipelines 384 960
    Core clock speed 980 MHz
    Boost Clock 1033 MHz
    Transistor count 1,270 million 2,540 million
    Manufacturing process technology 28 nm 28 nm
    Texture fill rate 22.7 billion/sec 78.4 billion/sec
    Floating-point performance 544.5 gflops 1,981 gflops
    Length 9.5" (24.1 cm)
    Memory bus width 128bit 192-bit GDDR5
    Memory clock speed 1800 MHz 6.0 GB/s
    Memory bandwidth 144.2 GB/s
    Shared memory -
    DirectX 12 API 12 (11_0)
    Shader Model 5.1 5.1
    OpenGL 4.5 4.3
    OpenCL 1.1 1.2
    Vulkan 1.1.126 1.1.126
    CUDA + +
    CUDA cores 384 960
    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 + +
    3D Gaming +
    3D Vision +
    Bitcoin / BTC (SHA256) 19 Mh/s 66 Mh/s
    Laptop size medium sized
    Optimus +
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