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    GeForce GTX 660M vs Radeon R9 M390X

    If you are going to buy a new graphics card and are choosing between GeForce GTX 660M and Radeon R9 M390X, 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 GTX 660M stacks up against Radeon R9 M390X, check out specs charts below.
    GeForce GTX 660M Check Price
    Radeon R9 M390X Check Price

    GeForce GTX 660M and Radeon R9 M390X are Laptop Graphics Cards

    Note: GeForce GTX 660M and Radeon R9 M390X 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 R9 M390X here:

    GeForce GTX 660M Laptops
    Radeon R9 M390X Laptops

    Main Specs

      GeForce GTX 660M Radeon R9 M390X
    Power consumption (TDP) 50 Watt 100 Watt
    Interface MXM-B (3.0) PCIe 3.0 x16
    Supplementary power connectors None
    Memory type GDDR5 GDDR5
    Maximum RAM amount 2 GB 4 GB
    Display Connectors No outputs No outputs
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    • Radeon R9 M390X has 100% more power consumption, than GeForce GTX 660M.
    • GeForce GTX 660M is connected by MXM-B (3.0), and Radeon R9 M390X uses PCIe 3.0 x16 interface.
    • Radeon R9 M390X has 2 GB more memory, than GeForce GTX 660M.
    • Both cards are used in Laptops.
    • GeForce GTX 660M is build with Kepler architecture, and Radeon R9 M390X - with GCN 3.
    • Core clock speed of GeForce GTX 660M is 112 MHz higher, than Radeon R9 M390X.
    • GeForce GTX 660M and Radeon R9 M390X are manufactured by 28 nm process technology.

    Game benchmarks

    high / 1080p 6−7 21−24
    ultra / 1080p 4−5 12−14
    QHD / 1440p 0−1 8−9
    4K / 2160p − 5−6
    low / 720p 16−18 40−45
    medium / 1080p 8−9 27−30
    The average gaming FPS of Radeon R9 M390X in Assassin's Creed Odyssey is 188% more, than GeForce GTX 660M.

    Full Specs

      GeForce GTX 660M Radeon R9 M390X
    Architecture Kepler GCN 3
    Code name N13E-GE Amethyst (XT) / Tonga
    Type Laptop Laptop
    Release date 22 March 2012 9 June 2015
    Pipelines 384 2048
    Core clock speed 835 MHz 723 MHz
    Boost Clock 950 MHz
    Transistor count 1,270 million 5,000 million
    Manufacturing process technology 28 nm 28 nm
    Texture fill rate 30.4 billion/sec 92.54
    Floating-point performance 729.6 gflops 2,961 gflops
    Memory bus width 128bit 256 Bit
    Memory clock speed 2000 MHz
    Memory bandwidth 64.0 GB/s 160.0 GB/s
    Shared memory - -
    DirectX 12 API
    Shader Model 5.1 6.3
    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
    SLI options +
    HDMI +
    HDCP +
    Maximum VGA resolution Up to 2048x1536
    Bitcoin / BTC (SHA256) 36 Mh/s
    Laptop size large large
    Optimus +
    Eyefinity +
    HD3D +
    PowerTune +
    DualGraphics +
    ZeroCore +
    Switchable graphics +
    Mantle +
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