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    GeForce GT 640M vs GeForce GTX 580M

    If you are going to buy a new graphics card and are choosing between GeForce GT 640M and GeForce GTX 580M, 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 GT 640M stacks up against GeForce GTX 580M, check out specs charts below.
    GeForce GT 640M Check Price
    GeForce GTX 580M Check Price

    GeForce GT 640M and GeForce GTX 580M are Laptop Graphics Cards

    Note: GeForce GT 640M and GeForce GTX 580M 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 640M or GeForce GTX 580M here:

    GeForce GT 640M Laptops
    GeForce GTX 580M Laptops

    Main Specs

      GeForce GT 640M GeForce GTX 580M
    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 MB
    Display Connectors No outputs No outputs
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    • GeForce GTX 580M has 212% more power consumption, than GeForce GT 640M.
    • GeForce GT 640M is connected by PCIe 3.0 x16, and GeForce GTX 580M uses MXM-B (3.0) interface.
    • GeForce GT 640M and GeForce GTX 580M have maximum RAM of 2 GB.
    • Both cards are used in Laptops.
    • GeForce GT 640M is build with Kepler architecture, and GeForce GTX 580M - with Fermi.
    • GeForce GT 640M is manufactured by 28 nm process technology, and GeForce GTX 580M - by 40 nm process technology.
    • Memory clock speed of GeForce GT 640M is 300 MHz higher, than GeForce GTX 580M.

    Game benchmarks

    high / 1080p 0−1 10−12
    ultra / 1080p 0−1 6−7
    QHD / 1440p 0−1 1−2
    low / 720p 10−12 24−27
    medium / 1080p 2−3 14−16
    The average gaming FPS of GeForce GTX 580M in Assassin's Creed Odyssey is 233% more, than GeForce GT 640M.

    Full Specs

      GeForce GT 640M GeForce GTX 580M
    Architecture Kepler Fermi
    Code name N13P-GS N12E-GTX2
    Type Laptop Laptop
    Release date 22 March 2012 28 June 2011
    Pipelines 384 384
    Core clock speed 620 MHz
    Boost Clock 645 MHz
    Transistor count 1,270 million 1,950 million
    Manufacturing process technology 28 nm 40 nm
    Texture fill rate 39.7 billion/sec
    Floating-point performance 480.0 gflops 952.3 gflops
    Memory bus width 128bit 256 Bit
    Memory clock speed 1800 - 4000 MHz 1500 MHz
    Memory bandwidth 96.0 GB/s
    Shared memory - -
    DirectX 12 API 12 API
    Shader Model 5.1 5.1
    OpenGL 4.5 4.5
    OpenCL 1.1 1.1
    Vulkan 1.1.126 N/A
    CUDA + +
    CUDA cores 384 384
    Bus support PCI Express 2.0, PCI Express 3.0 PCI-E 2.0
    SLI options +
    HDMI +
    HDCP +
    Maximum VGA resolution Up to 2048x1536
    3D Blu-Ray + +
    3D Gaming +
    Bitcoin / BTC (SHA256) 18 Mh/s 40 Mh/s
    Laptop size medium sized large
    Optimus + +
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