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    GeForce GT 645M vs Radeon R9 M390X

    If you are going to buy a new graphics card and are choosing between GeForce GT 645M and Radeon R9 M390X, 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 Radeon R9 M390X, check out specs charts below.
    GeForce GT 645M Check Price
    Radeon R9 M390X Check Price

    GeForce GT 645M and Radeon R9 M390X are Laptop Graphics Cards

    Note: GeForce GT 645M and Radeon R9 M390X 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 Radeon R9 M390X here:

    GeForce GT 645M Laptops
    Radeon R9 M390X Laptops

    Main Specs

      GeForce GT 645M Radeon R9 M390X
    Power consumption (TDP) 32 Watt 100 Watt
    Interface PCIe 3.0 x16 PCIe 3.0 x16
    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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    • Radeon R9 M390X has 212% more power consumption, than GeForce GT 645M.
    • Both video cards are using PCIe 3.0 x16 interface connection to a motherboard.
    • Radeon R9 M390X has 2 GB more memory, than GeForce GT 645M.
    • Both cards are used in Laptops.
    • GeForce GT 645M is build with Kepler architecture, and Radeon R9 M390X - with GCN 3.
    • GeForce GT 645M and Radeon R9 M390X are manufactured by 28 nm process technology.

    Game benchmarks

    high / 1080p 1−2 21−24
    ultra / 1080p 0−1 12−14
    QHD / 1440p 0−1 8−9
    4K / 2160p − 5−6
    low / 720p 12−14 40−45
    medium / 1080p 2−3 27−30
    The average gaming FPS of Radeon R9 M390X in Assassin's Creed Odyssey is 520% more, than GeForce GT 645M.

    Full Specs

      GeForce GT 645M Radeon R9 M390X
    Architecture Kepler GCN 3
    Code name N13P-GS Amethyst (XT) / Tonga
    Type Laptop Laptop
    Release date 22 March 2012 9 June 2015
    Pipelines 384 2048
    Core clock speed 723 MHz
    Transistor count 1,270 million 5,000 million
    Manufacturing process technology 28 nm 28 nm
    Texture fill rate 22.7 billion/sec 92.54
    Floating-point performance 544.5 gflops 2,961 gflops
    Memory bus width 128bit 256 Bit
    Memory clock speed 1800 MHz
    Memory bandwidth 160.0 GB/s
    Shared memory - -
    DirectX 12 API
    Shader Model 5.1 6.3
    OpenGL 4.5 4.4
    OpenCL 1.1 Not Listed
    Vulkan 1.1.126 +
    CUDA +
    FreeSync +
    CUDA cores 384
    Bus support PCI Express 2.0, PCI Express 3.0 PCIe 3.0
    HDMI +
    HDCP +
    Maximum VGA resolution Up to 2048x1536
    3D Blu-Ray +
    Bitcoin / BTC (SHA256) 19 Mh/s
    Laptop size medium sized large
    Optimus +
    Eyefinity +
    HD3D +
    PowerTune +
    DualGraphics +
    ZeroCore +
    Switchable graphics +
    Mantle +
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