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    Iris Plus Graphics 645 vs Mobility Radeon HD 3870 X2

    When comparing Iris Plus Graphics 645 and Mobility Radeon HD 3870 X2, 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 Iris Plus Graphics 645 and Mobility Radeon HD 3870 X2 is the price. Does the additional cost justify the performance hit? Our comparison should help you make the right decision.
    Iris Plus Graphics 645 Check Price
    Mobility Radeon HD 3870 X2 Check Price

    Iris Plus Graphics 645 and Mobility Radeon HD 3870 X2 are Laptop Graphics Cards

    Note: Iris Plus Graphics 645 and Mobility Radeon HD 3870 X2 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 Iris Plus Graphics 645 or Mobility Radeon HD 3870 X2 here:

    Iris Plus Graphics 645 Laptops
    Mobility Radeon HD 3870 X2 Laptops

    Main Specs

      Iris Plus Graphics 645 Mobility Radeon HD 3870 X2
    Power consumption (TDP) 15 Watt 110 Watt
    Interface PCIe 3.0 x1 PCIe 2.0 x16
    Memory type DDR3/DDR4 GDDR3
    Maximum RAM amount 512 MB
    Display Connectors No outputs No outputs
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    • Mobility Radeon HD 3870 X2 has 633% more power consumption, than Iris Plus Graphics 645.
    • Iris Plus Graphics 645 is connected by PCIe 3.0 x1, and Mobility Radeon HD 3870 X2 uses PCIe 2.0 x16 interface.
    • Both cards are used in Laptops.
    • Iris Plus Graphics 645 is build with Gen. 9.5 Coffee Lake architecture, and Mobility Radeon HD 3870 X2 - with RV6xx.
    • Core clock speed of Mobility Radeon HD 3870 X2 is 360 MHz higher, than Iris Plus Graphics 645.
    • Iris Plus Graphics 645 is manufactured by 14 nm process technology, and Mobility Radeon HD 3870 X2 - by 55 nm process technology.

    Game benchmarks

    high / 1080p 4−5 6−7
    ultra / 1080p 2−3 4−5
    QHD / 1440p 0−1 0−1
    low / 720p 12−14 16−18
    medium / 1080p 5−6 8−9
    The average gaming FPS of Mobility Radeon HD 3870 X2 in Assassin's Creed Odyssey is 50% more, than Iris Plus Graphics 645.

    Full Specs

      Iris Plus Graphics 645 Mobility Radeon HD 3870 X2
    Architecture Gen. 9.5 Coffee Lake RV6xx
    Code name Kaby Lake GT3e M88-XT CF
    Type Laptop Laptop
    Release date 10 July 2019 1 September 2008
    Pipelines 48 640
    Core clock speed 300 MHz 660 MHz
    Boost Clock 1150 MHz
    Transistor count 666 million
    Manufacturing process technology 14 nm 55 nm
    Texture fill rate 50.40 10.56
    Floating-point performance 2x 422.4 gflops
    Memory bus width 256 Bit
    Memory clock speed 850 MHz
    Memory bandwidth 54.4 GB/s
    Shared memory + -
    DirectX 12 (12_1) 10.1 (10_1)
    Shader Model 6.4 4.1
    OpenGL 4.6 3.3
    OpenCL 2.1 N/A
    Vulkan 1.1.103 N/A
    Laptop size large
    Quick Sync +
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