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    Mobility Radeon HD 3870 X2 vs Radeon R9 M390X

    Find out if it is worth upgrading your current GPU setup by comparing Mobility Radeon HD 3870 X2 and Radeon R9 M390X. Here you can take a closer look at graphics cards specs, such as core clock speed, memory type and size, display connectors, etc. The price, overall benchmark and gaming performances are usually defining factors when it comes to choosing between Mobility Radeon HD 3870 X2 and Radeon R9 M390X. Make sure that the graphics card has compatible dimensions and will properly fit in your new or current computer case. Also these graphics cards may have different system power recommendations, so take that into consideration and upgrade your PSU if necessary.
    Mobility Radeon HD 3870 X2 Check Price
    Radeon R9 M390X Check Price

    Mobility Radeon HD 3870 X2 and Radeon R9 M390X are Laptop Graphics Cards

    Note: Mobility Radeon HD 3870 X2 and Radeon R9 M390X 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 Mobility Radeon HD 3870 X2 or Radeon R9 M390X here:

    Mobility Radeon HD 3870 X2 Laptops
    Radeon R9 M390X Laptops

    Main Specs

      Mobility Radeon HD 3870 X2 Radeon R9 M390X
    Power consumption (TDP) 110 Watt 100 Watt
    Interface PCIe 2.0 x16 PCIe 3.0 x16
    Supplementary power connectors None
    Memory type GDDR3 GDDR5
    Maximum RAM amount 512 MB 4 GB
    Display Connectors No outputs No outputs
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    • Mobility Radeon HD 3870 X2 has 10% more power consumption, than Radeon R9 M390X.
    • Mobility Radeon HD 3870 X2 is connected by PCIe 2.0 x16, and Radeon R9 M390X uses PCIe 3.0 x16 interface.
    • Mobility Radeon HD 3870 X2 has 508 GB more memory, than Radeon R9 M390X.
    • Both cards are used in Laptops.
    • Mobility Radeon HD 3870 X2 is build with RV6xx architecture, and Radeon R9 M390X - with GCN 3.
    • Core clock speed of Radeon R9 M390X is 63 MHz higher, than Mobility Radeon HD 3870 X2.
    • Mobility Radeon HD 3870 X2 is manufactured by 55 nm process technology, and Radeon R9 M390X - by 28 nm process technology.

    Game benchmarks

    high / 1080p 6−7 21−24
    ultra / 1080p 4−5 12−14
    QHD / 1440p 0−1 8−9
    4K / 2160p − 5−6
    low / 720p 16−18 40−45
    medium / 1080p 8−9 27−30
    The average gaming FPS of Radeon R9 M390X in Assassin's Creed Odyssey is 188% more, than Mobility Radeon HD 3870 X2.

    Full Specs

      Mobility Radeon HD 3870 X2 Radeon R9 M390X
    Architecture RV6xx GCN 3
    Code name M88-XT CF Amethyst (XT) / Tonga
    Type Laptop Laptop
    Release date 1 September 2008 9 June 2015
    Pipelines 640 2048
    Core clock speed 660 MHz 723 MHz
    Transistor count 666 million 5,000 million
    Manufacturing process technology 55 nm 28 nm
    Texture fill rate 10.56 92.54
    Floating-point performance 2x 422.4 gflops 2,961 gflops
    Memory bus width 256 Bit 256 Bit
    Memory clock speed 850 MHz
    Memory bandwidth 54.4 GB/s 160.0 GB/s
    Shared memory - -
    DirectX 10.1 (10_1)
    Shader Model 4.1 6.3
    OpenGL 3.3 4.4
    OpenCL N/A Not Listed
    Vulkan N/A +
    FreeSync +
    Bus support PCIe 3.0
    Laptop size large large
    Eyefinity +
    HD3D +
    PowerTune +
    DualGraphics +
    ZeroCore +
    Switchable graphics +
    Mantle +
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