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    GeForce GT 645M vs GeForce GTX 870M

    If you are going to buy a new graphics card and are choosing between GeForce GT 645M and GeForce GTX 870M, there are a couple of things to consider. Cards with more VRAM in general perform better and allow you to play on higher graphics settings. Size also makes a difference. A model with a large heatsink can occupy up to three expansion slots on a motherboard. Be sure you have enough room in your PC case. When comparing GPUs with different architectures, more processing cores and even higher TFLOPS will not always translate to better performance. To help you decide which GPU you need, we have measured frame rates in a number of popular games. For more on how the GeForce GT 645M stacks up against GeForce GTX 870M, check out specs charts below.
    GeForce GT 645M Check Price
    GeForce GTX 870M Check Price

    GeForce GT 645M and GeForce GTX 870M are Laptop Graphics Cards

    Note: GeForce GT 645M and GeForce GTX 870M 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 870M here:

    GeForce GT 645M Laptops
    GeForce GTX 870M Laptops

    Main Specs

      GeForce GT 645M GeForce GTX 870M
    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 6 GB
    Display Connectors No outputs No outputs
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    • GeForce GTX 870M has 212% more power consumption, than GeForce GT 645M.
    • GeForce GT 645M is connected by PCIe 3.0 x16, and GeForce GTX 870M uses MXM-B (3.0) interface.
    • GeForce GTX 870M has 4 GB more memory, than GeForce GT 645M.
    • Both cards are used in Laptops.
    • GeForce GT 645M and GeForce GTX 870M are build with Kepler architecture.
    • GeForce GT 645M and GeForce GTX 870M are manufactured by 28 nm process technology.

    Game benchmarks

    high / 1080p 1−2 16−18
    ultra / 1080p 0−1 10−11
    QHD / 1440p 0−1 4−5
    low / 720p 12−14 35−40
    medium / 1080p 2−3 21−24
    The average gaming FPS of GeForce GTX 870M in Assassin's Creed Odyssey is 400% more, than GeForce GT 645M.

    Full Specs

      GeForce GT 645M GeForce GTX 870M
    Architecture Kepler Kepler
    Code name N13P-GS N15P-GT
    Type Laptop Laptop
    Release date 22 March 2012 12 March 2014
    Pipelines 384 1344
    Core clock speed 941 MHz
    Boost Clock 967 MHz
    Transistor count 1,270 million 3,540 million
    Manufacturing process technology 28 nm 28 nm
    Texture fill rate 22.7 billion/sec 108.3
    Floating-point performance 544.5 gflops 2,599 gflops
    Memory bus width 128bit 192 Bit
    Memory clock speed 1800 MHz
    Memory bandwidth 120.0 GB/s
    Shared memory - -
    DirectX 12 API 12 (11_0)
    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 2.0, PCI Express 3.0
    SLI options +
    HDMI + +
    HDCP +
    Maximum VGA resolution Up to 2048x1536
    3D Blu-Ray +
    Bitcoin / BTC (SHA256) 19 Mh/s 82 Mh/s
    Laptop size medium sized large
    Standard memory configuration GDDR5
    eDP 1.2 signal support Up to 3840x2160
    LVDS signal support Up to 1920x1200
    DisplayPort Multimode (DP++) support Up to 3840x2160
    HDCP content protection +
    7.1 channel HD audio on HDMI +
    TrueHD and DTS-HD audio bitstreaming +
    H.264, VC1, MPEG2 1080p video decoder +
    Optimus + +
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