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    Mobility Radeon HD 3870 X2 vs Radeon R9 M385X

    If you are going to buy a new graphics card and are choosing between Mobility Radeon HD 3870 X2 and Radeon R9 M385X, there are a couple of things to consider. Cards with more VRAM in general perform better and allow you to play on higher graphics settings. Size also makes a difference. A model with a large heatsink can occupy up to three expansion slots on a motherboard. Be sure you have enough room in your PC case. When comparing GPUs with different architectures, more processing cores and even higher TFLOPS will not always translate to better performance. To help you decide which GPU you need, we have measured frame rates in a number of popular games. For more on how the Mobility Radeon HD 3870 X2 stacks up against Radeon R9 M385X, check out specs charts below.
    Mobility Radeon HD 3870 X2 Check Price
    Radeon R9 M385X Check Price

    Mobility Radeon HD 3870 X2 and Radeon R9 M385X are Laptop Graphics Cards

    Note: Mobility Radeon HD 3870 X2 and Radeon R9 M385X 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 M385X here:

    Mobility Radeon HD 3870 X2 Laptops
    Radeon R9 M385X Laptops

    Main Specs

      Mobility Radeon HD 3870 X2 Radeon R9 M385X
    Power consumption (TDP) 110 Watt
    Interface PCIe 2.0 x16 PCIe 3.0 x16
    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 is connected by PCIe 2.0 x16, and Radeon R9 M385X uses PCIe 3.0 x16 interface.
    • Mobility Radeon HD 3870 X2 has 508 GB more memory, than Radeon R9 M385X.
    • Both cards are used in Laptops.
    • Mobility Radeon HD 3870 X2 is build with RV6xx architecture, and Radeon R9 M385X - with GCN.
    • Core clock speed of Radeon R9 M385X is 440 MHz higher, than Mobility Radeon HD 3870 X2.
    • Mobility Radeon HD 3870 X2 is manufactured by 55 nm process technology, and Radeon R9 M385X - by 28 nm process technology.
    • Memory clock speed of Radeon R9 M385X is 650 MHz higher, than Mobility Radeon HD 3870 X2.

    Game benchmarks

    high / 1080p 6−7 8−9
    ultra / 1080p 4−5 5−6
    QHD / 1440p 0−1 0−1
    low / 720p 16−18 18−20
    medium / 1080p 8−9 10−11
    The average gaming FPS of Radeon R9 M385X in Assassin's Creed Odyssey is 11% more, than Mobility Radeon HD 3870 X2.

    Full Specs

      Mobility Radeon HD 3870 X2 Radeon R9 M385X
    Architecture RV6xx GCN
    Code name M88-XT CF Strato-XT-M3
    Type Laptop Laptop
    Release date 1 September 2008 16 June 2015
    Pipelines 640 896
    Core clock speed 660 MHz 1100 MHz
    Boost Clock 1100 MHz
    Transistor count 666 million 2,080 million
    Manufacturing process technology 55 nm 28 nm
    Texture fill rate 10.56 61.60
    Floating-point performance 2x 422.4 gflops 1,971 gflops
    Memory bus width 256 Bit 128 Bit
    Memory clock speed 850 MHz 1500 MHz
    Memory bandwidth 54.4 GB/s 76.8 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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