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    GeForce GT 645M vs Radeon HD 7970M Crossfire

    If you are going to buy a new graphics card and are choosing between GeForce GT 645M and Radeon HD 7970M Crossfire, 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 HD 7970M Crossfire, check out specs charts below.
    GeForce GT 645M Check Price
    Radeon HD 7970M Crossfire Check Price

    GeForce GT 645M and Radeon HD 7970M Crossfire are Laptop Graphics Cards

    Note: GeForce GT 645M and Radeon HD 7970M Crossfire 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 HD 7970M Crossfire here:

    GeForce GT 645M Laptops
    Radeon HD 7970M Crossfire Laptops

    Main Specs

      GeForce GT 645M Radeon HD 7970M Crossfire
    Power consumption (TDP) 32 Watt 200 Watt
    Interface PCIe 3.0 x16
    Memory type DDR3\GDDR5 GDDR5
    Maximum RAM amount 2 GB
    Display Connectors No outputs
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    • Radeon HD 7970M Crossfire has 525% more power consumption, than GeForce GT 645M.
    • Both cards are used in Laptops.
    • GeForce GT 645M is build with Kepler architecture, and Radeon HD 7970M Crossfire - with GCN.
    • GeForce GT 645M and Radeon HD 7970M Crossfire are manufactured by 28 nm process technology.
    • Memory clock speed of Radeon HD 7970M Crossfire is 3000 MHz higher, than GeForce GT 645M.

    Game benchmarks

    high / 1080p 1−2 35−40
    ultra / 1080p 0−1 21−24
    QHD / 1440p 0−1 16−18
    4K / 2160p − 10−11
    low / 720p 12−14 60−65
    medium / 1080p 2−3 40−45
    The average gaming FPS of Radeon HD 7970M Crossfire in Assassin's Creed Odyssey is 840% more, than GeForce GT 645M.

    Full Specs

      GeForce GT 645M Radeon HD 7970M Crossfire
    Architecture Kepler GCN
    Code name N13P-GS Wimbledon XT
    Type Laptop Laptop
    Release date 22 March 2012 1 May 2012
    Pipelines 384 2560
    Core clock speed 850 MHz
    Transistor count 1,270 million
    Manufacturing process technology 28 nm 28 nm
    Texture fill rate 22.7 billion/sec
    Floating-point performance 544.5 gflops
    Memory bus width 128bit 2x 256 Bit
    Memory clock speed 1800 MHz 4800 MHz
    Shared memory - -
    DirectX 12 API DirectX 11.1, Shader 5.0
    Shader Model 5.1
    OpenGL 4.5
    OpenCL 1.1
    Vulkan 1.1.126
    CUDA +
    CUDA cores 384
    Bus support PCI Express 2.0, PCI Express 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 +
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