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    GeForce GT 645M vs Radeon HD 4870 X2

    In this comparison between GeForce GT 645M and Radeon HD 4870 X2 you will find out which graphics card performs better in today's games. Bear in mind that third-party versions may have more efficient cooling and higher clock speeds. This will increase cards' performance, though not by much. In addition to raw power you should also take into account the dimensions. Thicker models simply will not fit into a small mini-ITX case. The resolution of your monitor also affects the choice, since 4K gameplay requires a more powerful GPU. And don't overspend on the graphics card. Other parts of your build may also need to be upgraded, save some money for the CPU or power supply. For some people GeForce GT 645M will be the best choice, for others Radeon HD 4870 X2 will be their preference. Study the comparison tables below and make your choice.
    GeForce GT 645M Check Price
    Radeon HD 4870 X2

    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 4870 X2
    Power consumption (TDP) 32 Watt 286 Watt
    Interface PCIe 3.0 x16 PCIe 2.0 x16
    Supplementary power connectors 1x 6-pin + 1x 8-pin
    Memory type DDR3\GDDR5 GDDR5
    Maximum RAM amount 2 GB 1 GB
    Display Connectors No outputs 2x DVI, 1x S-Video
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    • Radeon HD 4870 X2 has 793% more power consumption, than GeForce GT 645M.
    • GeForce GT 645M is connected by PCIe 3.0 x16, and Radeon HD 4870 X2 uses PCIe 2.0 x16 interface.
    • GeForce GT 645M has 1 GB more memory, than Radeon HD 4870 X2.
    • GeForce GT 645M is used in Laptops, and Radeon HD 4870 X2 - in Desktops.
    • GeForce GT 645M is build with Kepler architecture, and Radeon HD 4870 X2 - with TeraScale.
    • GeForce GT 645M is manufactured by 28 nm process technology, and Radeon HD 4870 X2 - by 55 nm process technology.
    • Memory clock speed of Radeon HD 4870 X2 is 1800 MHz higher, than GeForce GT 645M.

    Game benchmarks

    high / 1080p 1−2 3−4
    ultra / 1080p 0−1 1−2
    QHD / 1440p 0−1 0−1
    low / 720p 12−14 14−16
    medium / 1080p 2−3 6−7
    The average gaming FPS of Radeon HD 4870 X2 in Assassin's Creed Odyssey is 60% more, than GeForce GT 645M.

    Full Specs

      GeForce GT 645M Radeon HD 4870 X2
    Architecture Kepler TeraScale
    Code name N13P-GS R700
    Type Laptop Desktop
    Release date 22 March 2012 12 August 2008
    Pipelines 384 800
    Core clock speed 700 MHz
    Transistor count 1,270 million 956 million
    Manufacturing process technology 28 nm 55 nm
    Texture fill rate 22.7 billion/sec 28.00
    Floating-point performance 544.5 gflops 2x 1,120.0 gflops
    Length 267 mm
    Memory bus width 128bit 256 Bit
    Memory clock speed 1800 MHz 3600 MHz
    Memory bandwidth 115.2 GB/s
    Shared memory -
    DirectX 12 API 10.1 (10_1)
    Shader Model 5.1 4.1
    OpenGL 4.5 3.3
    OpenCL 1.1 1.1
    Vulkan 1.1.126 N/A
    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) 19 Mh/s
    Laptop size medium sized
    Optimus +
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