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    GeForce GT 640M vs Radeon HD 7990

    When comparing GeForce GT 640M and Radeon HD 7990, 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 GT 640M and Radeon HD 7990 is the price. Does the additional cost justify the performance hit? Our comparison should help you make the right decision.
    GeForce GT 640M Check Price
    Radeon HD 7990 Check Price

    GeForce GT 640M is a Laptop Graphics Card

    Note: GeForce GT 640M is only used in laptop graphics. It has 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 here:

    GeForce GT 640M Laptops

    Main Specs

      GeForce GT 640M Radeon HD 7990
    Power consumption (TDP) 32 Watt 375 Watt
    Interface PCIe 3.0 x16 PCIe 3.0 x16
    Supplementary power connectors 2x 8-pin
    Memory type DDR3\GDDR5 GDDR5
    Maximum RAM amount 2 GB 3 GB
    Display Connectors No outputs 1x DVI, 4x mini-DisplayPort
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    • Radeon HD 7990 has 1071% more power consumption, than GeForce GT 640M.
    • Both video cards are using PCIe 3.0 x16 interface connection to a motherboard.
    • Radeon HD 7990 has 1 GB more memory, than GeForce GT 640M.
    • GeForce GT 640M is used in Laptops, and Radeon HD 7990 - in Desktops.
    • GeForce GT 640M is build with Kepler architecture, and Radeon HD 7990 - with GCN 1.0.
    • GeForce GT 640M and Radeon HD 7990 are manufactured by 28 nm process technology.
    • Memory clock speed of Radeon HD 7990 is 4200 MHz higher, than GeForce GT 640M.

    Game benchmarks

    high / 1080p 0−1 35−40
    ultra / 1080p 0−1 21−24
    QHD / 1440p 0−1 16−18
    4K / 2160p − 10−11
    low / 720p 10−12 60−65
    medium / 1080p 2−3 40−45
    The average gaming FPS of Radeon HD 7990 in Assassin's Creed Odyssey is 766% more, than GeForce GT 640M.

    Full Specs

      GeForce GT 640M Radeon HD 7990
    Architecture Kepler GCN 1.0
    Code name N13P-GS Malta
    Type Laptop Desktop
    Release date 22 March 2012 24 April 2013
    Pipelines 384 2048
    Core clock speed 950 MHz
    Boost Clock 645 MHz 1000 MHz
    Transistor count 1,270 million 4,313 million
    Manufacturing process technology 28 nm 28 nm
    Texture fill rate 128.0
    Floating-point performance 480.0 gflops 2x 4,096 gflops
    Length 307 mm
    Memory bus width 128bit 384 Bit
    Memory clock speed 1800 - 4000 MHz 6000 MHz
    Memory bandwidth 288.0 GB/s
    Shared memory -
    DirectX 12 API 12 (11_1)
    Shader Model 5.1 5.1
    OpenGL 4.5 4.6
    OpenCL 1.1 1.2
    Vulkan 1.1.126 1.2.131
    CUDA +
    CUDA cores 384
    Bus support PCI Express 2.0, PCI Express 3.0
    HDMI +
    HDCP +
    Maximum VGA resolution Up to 2048x1536
    3D Blu-Ray +
    Bitcoin / BTC (SHA256) 18 Mh/s 459 Mh/s
    Laptop size medium sized
    Optimus +
    Ethereum / ETH (DaggerHashimoto) 44 Mh/s
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