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    GeForce GT 645M vs Radeon HD 6990M Crossfire

    In this comparison between GeForce GT 645M and Radeon HD 6990M Crossfire 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 HD 6990M Crossfire will be their preference. Study the comparison tables below and make your choice.
    GeForce GT 645M Check Price
    Radeon HD 6990M Crossfire Check Price

    GeForce GT 645M and Radeon HD 6990M Crossfire are Laptop Graphics Cards

    Note: GeForce GT 645M and Radeon HD 6990M 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 6990M Crossfire here:

    GeForce GT 645M Laptops
    Radeon HD 6990M Crossfire Laptops

    Main Specs

      GeForce GT 645M Radeon HD 6990M Crossfire
    Power consumption (TDP) 32 Watt
    Interface PCIe 3.0 x16
    Memory type DDR3\GDDR5 GDDR5
    Maximum RAM amount 2 GB 2x2 GB
    Display Connectors No outputs
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    • GeForce GT 645M and Radeon HD 6990M Crossfire have maximum RAM of 2 GB.
    • Both cards are used in Laptops.
    • GeForce GT 645M is build with Kepler architecture, and Radeon HD 6990M Crossfire - with Terascale 2.
    • GeForce GT 645M is manufactured by 28 nm process technology, and Radeon HD 6990M Crossfire - by 40 nm process technology.
    • Memory clock speed of GeForce GT 645M is 900 MHz higher, than Radeon HD 6990M Crossfire.

    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 6990M Crossfire in Assassin's Creed Odyssey is 840% more, than GeForce GT 645M.

    Full Specs

      GeForce GT 645M Radeon HD 6990M Crossfire
    Architecture Kepler Terascale 2
    Code name N13P-GS Blackcomb XTX
    Type Laptop Laptop
    Release date 22 March 2012 12 July 2011
    Pipelines 384 2240
    Core clock speed 715 MHz
    Transistor count 1,270 million 2x1700 Million
    Manufacturing process technology 28 nm 40 nm
    Texture fill rate 22.7 billion/sec
    Floating-point performance 544.5 gflops
    Memory bus width 128bit 256 Bit
    Memory clock speed 1800 MHz 900 MHz
    Shared memory - -
    DirectX 12 API DirectX 11, 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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