Subscribe to our YouTube channel ×

    GeForce GTX 660M vs Radeon RX 640

    If you are going to buy a new graphics card and are choosing between GeForce GTX 660M and Radeon RX 640, 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 RX 640, check out specs charts below.
    GeForce GTX 660M Check Price
    Radeon RX 640 Check Price

    GeForce GTX 660M and Radeon RX 640 are Laptop Graphics Cards

    Note: GeForce GTX 660M and Radeon RX 640 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 RX 640 here:

    GeForce GTX 660M Laptops
    Radeon RX 640 Laptops

    Main Specs

      GeForce GTX 660M Radeon RX 640
    Power consumption (TDP) 50 Watt 50 Watt
    Interface MXM-B (3.0) PCIe 3.0 x8
    Supplementary power connectors None
    Memory type GDDR5 GDDR5
    Maximum RAM amount 2 GB 4 GB
    Display Connectors No outputs 1x DVI, 1x HDMI, 1x DisplayPort
      Check Price Check Price
    • Both graphics cards have the same power consumption of 50 Watt.
    • GeForce GTX 660M is connected by MXM-B (3.0), and Radeon RX 640 uses PCIe 3.0 x8 interface.
    • Radeon RX 640 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 RX 640 - with Polaris.
    • Core clock speed of Radeon RX 640 is 383 MHz higher, than GeForce GTX 660M.
    • GeForce GTX 660M is manufactured by 28 nm process technology, and Radeon RX 640 - by 14 nm process technology.
    • Memory clock speed of Radeon RX 640 is 4000 MHz higher, than GeForce GTX 660M.

    Game benchmarks

    high / 1080p 6−7 5−6
    ultra / 1080p 4−5 3−4
    QHD / 1440p 0−1 2−3
    low / 720p 16−18 16−18
    medium / 1080p 8−9 7−8
    The average gaming FPS of GeForce GTX 660M in Assassin's Creed Odyssey is 12% more, than Radeon RX 640.

    Full Specs

      GeForce GTX 660M Radeon RX 640
    Architecture Kepler Polaris
    Code name N13E-GE Polaris 12
    Type Laptop Laptop
    Release date 22 March 2012 12 August 2019
    Pipelines 384 640
    Core clock speed 835 MHz 1218 MHz
    Boost Clock 950 MHz 1218 MHz
    Transistor count 1,270 million 2,200 million
    Manufacturing process technology 28 nm 14 nm
    Texture fill rate 30.4 billion/sec 38.98
    Floating-point performance 729.6 gflops
    Memory bus width 128bit 64 Bit
    Memory clock speed 2000 MHz 6000 MHz
    Memory bandwidth 64.0 GB/s 112.0 GB/s
    Shared memory - -
    DirectX 12 API 12 (12_0)
    Shader Model 5.1 6.4
    OpenGL 4.5 4.6
    OpenCL 1.1 2.0
    Vulkan 1.1.126 1.2.131
    CUDA +
    FreeSync +
    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 +
      Check Price Check Price

    Similar compares