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    GeForce GTX 660M vs Radeon HD 6990M Crossfire

    In this comparison between GeForce GTX 660M 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 GTX 660M 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 GTX 660M Check Price
    Radeon HD 6990M Crossfire Check Price

    GeForce GTX 660M and Radeon HD 6990M Crossfire are Laptop Graphics Cards

    Note: GeForce GTX 660M 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 GTX 660M or Radeon HD 6990M Crossfire here:

    GeForce GTX 660M Laptops
    Radeon HD 6990M Crossfire Laptops

    Main Specs

      GeForce GTX 660M Radeon HD 6990M Crossfire
    Power consumption (TDP) 50 Watt
    Interface MXM-B (3.0)
    Memory type GDDR5 GDDR5
    Maximum RAM amount 2 GB 2x2 GB
    Display Connectors No outputs
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    • GeForce GTX 660M and Radeon HD 6990M Crossfire have maximum RAM of 2 GB.
    • Both cards are used in Laptops.
    • GeForce GTX 660M is build with Kepler architecture, and Radeon HD 6990M Crossfire - with Terascale 2.
    • Core clock speed of GeForce GTX 660M is 120 MHz higher, than Radeon HD 6990M Crossfire.
    • GeForce GTX 660M is manufactured by 28 nm process technology, and Radeon HD 6990M Crossfire - by 40 nm process technology.
    • Memory clock speed of GeForce GTX 660M is 1100 MHz higher, than Radeon HD 6990M Crossfire.

    Game benchmarks

    high / 1080p 6−7 35−40
    ultra / 1080p 4−5 21−24
    QHD / 1440p 0−1 16−18
    4K / 2160p − 10−11
    low / 720p 16−18 60−65
    medium / 1080p 8−9 40−45
    The average gaming FPS of Radeon HD 6990M Crossfire in Assassin's Creed Odyssey is 355% more, than GeForce GTX 660M.

    Full Specs

      GeForce GTX 660M Radeon HD 6990M Crossfire
    Architecture Kepler Terascale 2
    Code name N13E-GE Blackcomb XTX
    Type Laptop Laptop
    Release date 22 March 2012 12 July 2011
    Pipelines 384 2240
    Core clock speed 835 MHz 715 MHz
    Boost Clock 950 MHz
    Transistor count 1,270 million 2x1700 Million
    Manufacturing process technology 28 nm 40 nm
    Texture fill rate 30.4 billion/sec
    Floating-point performance 729.6 gflops
    Memory bus width 128bit 256 Bit
    Memory clock speed 2000 MHz 900 MHz
    Memory bandwidth 64.0 GB/s
    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
    SLI options +
    HDMI +
    HDCP +
    Maximum VGA resolution Up to 2048x1536
    Bitcoin / BTC (SHA256) 36 Mh/s
    Laptop size large large
    Optimus +
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