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    GeForce GTX 660M vs Radeon R9 M385X

    When comparing GeForce GTX 660M and Radeon R9 M385X, 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 GTX 660M and Radeon R9 M385X is the price. Does the additional cost justify the performance hit? Our comparison should help you make the right decision.
    GeForce GTX 660M Check Price
    Radeon R9 M385X Check Price

    GeForce GTX 660M and Radeon R9 M385X are Laptop Graphics Cards

    Note: GeForce GTX 660M and Radeon R9 M385X 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 M385X here:

    GeForce GTX 660M Laptops
    Radeon R9 M385X Laptops

    Main Specs

      GeForce GTX 660M Radeon R9 M385X
    Power consumption (TDP) 50 Watt
    Interface MXM-B (3.0) PCIe 3.0 x16
    Memory type GDDR5 GDDR5
    Maximum RAM amount 2 GB 4 GB
    Display Connectors No outputs No outputs
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    • GeForce GTX 660M is connected by MXM-B (3.0), and Radeon R9 M385X uses PCIe 3.0 x16 interface.
    • Radeon R9 M385X 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 M385X - with GCN.
    • Core clock speed of Radeon R9 M385X is 265 MHz higher, than GeForce GTX 660M.
    • GeForce GTX 660M and Radeon R9 M385X are manufactured by 28 nm process technology.
    • Memory clock speed of GeForce GTX 660M is 500 MHz higher, than Radeon R9 M385X.

    Game benchmarks

    high / 1080p 6−7 8−9
    ultra / 1080p 4−5 5−6
    QHD / 1440p 0−1 0−1
    low / 720p 16−18 18−20
    medium / 1080p 8−9 10−11
    The average gaming FPS of Radeon R9 M385X in Assassin's Creed Odyssey is 11% more, than GeForce GTX 660M.

    Full Specs

      GeForce GTX 660M Radeon R9 M385X
    Architecture Kepler GCN
    Code name N13E-GE Strato-XT-M3
    Type Laptop Laptop
    Release date 22 March 2012 16 June 2015
    Pipelines 384 896
    Core clock speed 835 MHz 1100 MHz
    Boost Clock 950 MHz 1100 MHz
    Transistor count 1,270 million 2,080 million
    Manufacturing process technology 28 nm 28 nm
    Texture fill rate 30.4 billion/sec 61.60
    Floating-point performance 729.6 gflops 1,971 gflops
    Memory bus width 128bit 128 Bit
    Memory clock speed 2000 MHz 1500 MHz
    Memory bandwidth 64.0 GB/s 76.8 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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