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    GeForce GT 645M vs Radeon R7 M340

    In this comparison between GeForce GT 645M and Radeon R7 M340 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 Radeon R7 M340 will be their preference. Study the comparison tables below and make your choice.
    GeForce GT 645M Check Price
    Radeon R7 M340 Check Price

    GeForce GT 645M and Radeon R7 M340 are Laptop Graphics Cards

    Note: GeForce GT 645M and Radeon R7 M340 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 R7 M340 here:

    GeForce GT 645M Laptops
    Radeon R7 M340 Laptops

    Main Specs

      GeForce GT 645M Radeon R7 M340
    Power consumption (TDP) 32 Watt
    Interface PCIe 3.0 x16 PCIe 3.0 x8
    Supplementary power connectors None
    Memory type DDR3\GDDR5 DDR3
    Maximum RAM amount 2 GB 4 GB
    Display Connectors No outputs No outputs
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    • GeForce GT 645M is connected by PCIe 3.0 x16, and Radeon R7 M340 uses PCIe 3.0 x8 interface.
    • Radeon R7 M340 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 R7 M340 - with GCN.
    • GeForce GT 645M and Radeon R7 M340 are manufactured by 28 nm process technology.
    • Memory clock speed of GeForce GT 645M is 800 MHz higher, than Radeon R7 M340.

    Game benchmarks

    high / 1080p 1−2 0−1
    ultra / 1080p 0−1 −
    QHD / 1440p 0−1 0−1
    low / 720p 12−14 1−2
    medium / 1080p 2−3 0−1
    The average gaming FPS of GeForce GT 645M in Assassin's Creed Odyssey is 1200% more, than Radeon R7 M340.

    Full Specs

      GeForce GT 645M Radeon R7 M340
    Architecture Kepler GCN
    Code name N13P-GS Meso Pro DDR3
    Type Laptop Laptop
    Release date 22 March 2012 16 June 2015
    Pipelines 384 320
    Core clock speed 1021 MHz
    Boost Clock 1021 MHz
    Transistor count 1,270 million 950 million
    Manufacturing process technology 28 nm 28 nm
    Texture fill rate 22.7 billion/sec 17.16
    Floating-point performance 544.5 gflops 549.1 gflops
    Memory bus width 128bit 128 Bit
    Memory clock speed 1800 MHz 1000 MHz
    Memory bandwidth 16 GB/s
    Shared memory - -
    DirectX 12 API
    Shader Model 5.1 5.1
    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 74 Mh/s
    Laptop size medium sized
    Optimus +
    Eyefinity +
    HD3D +
    PowerTune +
    DualGraphics +
    ZeroCore +
    Switchable graphics +
    Mantle +
    Compute units 6
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