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    GeForce GT 645M vs Radeon HD 7970

    When comparing GeForce GT 645M and Radeon HD 7970, 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 645M and Radeon HD 7970 is the price. Does the additional cost justify the performance hit? Our comparison should help you make the right decision.
    GeForce GT 645M Check Price
    Radeon HD 7970 Check Price

    GeForce GT 645M is a Laptop Graphics Card

    Note: GeForce GT 645M 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 645M here:

    GeForce GT 645M Laptops

    Main Specs

      GeForce GT 645M Radeon HD 7970
    Power consumption (TDP) 32 Watt 300 Watt
    Interface PCIe 3.0 x16 PCIe 3.0 x16
    Supplementary power connectors 1x 6-pin + 1x 8-pin
    Memory type DDR3\GDDR5 GDDR5
    Maximum RAM amount 2 GB 3 GB
    Display Connectors No outputs 1x DVI, 1x HDMI, 2x mini-DisplayPort
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    • Radeon HD 7970 has 837% more power consumption, than GeForce GT 645M.
    • Both video cards are using PCIe 3.0 x16 interface connection to a motherboard.
    • Radeon HD 7970 has 1 GB more memory, than GeForce GT 645M.
    • GeForce GT 645M is used in Laptops, and Radeon HD 7970 - in Desktops.
    • GeForce GT 645M is build with Kepler architecture, and Radeon HD 7970 - with GCN.
    • GeForce GT 645M and Radeon HD 7970 are manufactured by 28 nm process technology.
    • Memory clock speed of GeForce GT 645M is 425 MHz higher, than Radeon HD 7970.

    Game benchmarks

    high / 1080p 1−2 35−40
    ultra / 1080p 0−1 21−24
    QHD / 1440p 0−1 16−18
    4K / 2160p − 10−11
    low / 720p 12−14 60−65
    medium / 1080p 2−3 40−45
    The average gaming FPS of Radeon HD 7970 in Assassin's Creed Odyssey is 840% more, than GeForce GT 645M.

    Full Specs

      GeForce GT 645M Radeon HD 7970
    Architecture Kepler GCN
    Code name N13P-GS Tahiti XT
    Type Laptop Desktop
    Release date 22 March 2012 22 December 2011
    Pipelines 384 2048
    Boost Clock 925 MHz
    Transistor count 1,270 million 4,313 million
    Manufacturing process technology 28 nm 28 nm
    Texture fill rate 22.7 billion/sec 118.4
    Floating-point performance 544.5 gflops 3,789 gflops
    Length 274 mm
    Memory bus width 128bit 384 Bit
    Memory clock speed 1800 MHz 1375 MHz
    Memory bandwidth 264 GB/s
    Shared memory - -
    DirectX 12 API
    Shader Model 5.1 5.1
    OpenGL 4.5 4.6
    OpenCL 1.1 1.2
    Vulkan 1.1.126
    CUDA +
    FreeSync +
    CUDA cores 384
    Bus support PCI Express 2.0, PCI Express 3.0 PCIe 2.1 x16
    HDMI + +
    HDCP +
    Maximum VGA resolution Up to 2048x1536
    3D Blu-Ray +
    Bitcoin / BTC (SHA256) 19 Mh/s 485 Mh/s
    Laptop size medium sized
    Optimus +
    Eyefinity +
    Design reference
    CrossFire +
    Ethereum / ETH (DaggerHashimoto) 20.71 Mh/s
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