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    GeForce GT 645M vs Radeon HD 6990M

    When comparing GeForce GT 645M and Radeon HD 6990M, we look primarily at benchmarks and game tests. But it is not only about the numbers. Often you can find third-party models with higher clock speeds, better cooling, or a customizable RGB lighting. Not all of them will have all the features you need. Another thing to consider is the port selection. Most graphics cards have at least one DisplayPort and HDMI interface, but some monitors require DVI. Before you buy, check the TDP of the graphics card - this characteristic will help you estimate the consumption of the graphics card. You may even have to upgrade your PSU to meet its requirements. An important factor when choosing between GeForce GT 645M and Radeon HD 6990M is the price. Does the additional cost justify the performance hit? Our comparison should help you make the right decision.
    GeForce GT 645M Check Price
    Radeon HD 6990M Check Price

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

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

    GeForce GT 645M Laptops
    Radeon HD 6990M Laptops

    Main Specs

      GeForce GT 645M Radeon HD 6990M
    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 2 GB
    Display Connectors No outputs No outputs
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    • Radeon HD 6990M has 212% more power consumption, than GeForce GT 645M.
    • GeForce GT 645M is connected by PCIe 3.0 x16, and Radeon HD 6990M uses MXM-B (3.0) interface.
    • GeForce GT 645M and Radeon HD 6990M have maximum RAM of 2 GB.
    • Both cards are used in Laptops.
    • GeForce GT 645M is build with Kepler architecture, and Radeon HD 6990M - with Terascale 2.
    • GeForce GT 645M is manufactured by 28 nm process technology, and Radeon HD 6990M - by 40 nm process technology.
    • Memory clock speed of GeForce GT 645M is 900 MHz higher, than Radeon HD 6990M.

    Game benchmarks

    high / 1080p 1−2 14−16
    ultra / 1080p 0−1 8−9
    QHD / 1440p 0−1 3−4
    low / 720p 12−14 30−33
    medium / 1080p 2−3 16−18
    The average gaming FPS of Radeon HD 6990M in Assassin's Creed Odyssey is 320% more, than GeForce GT 645M.

    Full Specs

      GeForce GT 645M Radeon HD 6990M
    Architecture Kepler Terascale 2
    Code name N13P-GS Blackcomb XTX
    Type Laptop Laptop
    Release date 22 March 2012 12 July 2011
    Pipelines 384 1120
    Core clock speed 715 MHz
    Transistor count 1,270 million 1,700 million
    Manufacturing process technology 28 nm 40 nm
    Texture fill rate 22.7 billion/sec 40.04
    Floating-point performance 544.5 gflops 1,601.6 gflops
    Memory bus width 128bit 256 Bit
    Memory clock speed 1800 MHz 900 MHz
    Memory bandwidth 115.2 GB/s
    Shared memory - -
    DirectX 12 API 11.2 (11_0)
    Shader Model 5.1 5.0
    OpenGL 4.5 4.4
    OpenCL 1.1 1.2
    Vulkan 1.1.126 N/A
    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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