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    Mobility Radeon HD 3870 X2 vs Radeon R7 M340

    When comparing Mobility Radeon HD 3870 X2 and Radeon R7 M340, 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 Mobility Radeon HD 3870 X2 and Radeon R7 M340 is the price. Does the additional cost justify the performance hit? Our comparison should help you make the right decision.
    Mobility Radeon HD 3870 X2 Check Price
    Radeon R7 M340 Check Price

    Mobility Radeon HD 3870 X2 and Radeon R7 M340 are Laptop Graphics Cards

    Note: Mobility Radeon HD 3870 X2 and Radeon R7 M340 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 R7 M340 here:

    Mobility Radeon HD 3870 X2 Laptops
    Radeon R7 M340 Laptops

    Main Specs

      Mobility Radeon HD 3870 X2 Radeon R7 M340
    Power consumption (TDP) 110 Watt
    Interface PCIe 2.0 x16 PCIe 3.0 x8
    Supplementary power connectors None
    Memory type GDDR3 DDR3
    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 R7 M340 uses PCIe 3.0 x8 interface.
    • Mobility Radeon HD 3870 X2 has 508 GB more memory, than Radeon R7 M340.
    • Both cards are used in Laptops.
    • Mobility Radeon HD 3870 X2 is build with RV6xx architecture, and Radeon R7 M340 - with GCN.
    • Core clock speed of Radeon R7 M340 is 361 MHz higher, than Mobility Radeon HD 3870 X2.
    • Mobility Radeon HD 3870 X2 is manufactured by 55 nm process technology, and Radeon R7 M340 - by 28 nm process technology.
    • Memory clock speed of Radeon R7 M340 is 150 MHz higher, than Mobility Radeon HD 3870 X2.

    Game benchmarks

    high / 1080p 6−7 0−1
    ultra / 1080p 4−5 −
    QHD / 1440p 0−1 0−1
    low / 720p 16−18 1−2
    medium / 1080p 8−9 0−1
    The average gaming FPS of Mobility Radeon HD 3870 X2 in Assassin's Creed Odyssey is 1600% more, than Radeon R7 M340.

    Full Specs

      Mobility Radeon HD 3870 X2 Radeon R7 M340
    Architecture RV6xx GCN
    Code name M88-XT CF Meso Pro DDR3
    Type Laptop Laptop
    Release date 1 September 2008 16 June 2015
    Pipelines 640 320
    Core clock speed 660 MHz 1021 MHz
    Boost Clock 1021 MHz
    Transistor count 666 million 950 million
    Manufacturing process technology 55 nm 28 nm
    Texture fill rate 10.56 17.16
    Floating-point performance 2x 422.4 gflops 549.1 gflops
    Memory bus width 256 Bit 128 Bit
    Memory clock speed 850 MHz 1000 MHz
    Memory bandwidth 54.4 GB/s 16 GB/s
    Shared memory - -
    DirectX 10.1 (10_1)
    Shader Model 4.1 5.1
    OpenGL 3.3 4.4
    OpenCL N/A Not Listed
    Vulkan N/A +
    FreeSync +
    Bus support PCIe 3.0
    Bitcoin / BTC (SHA256) 74 Mh/s
    Laptop size large
    Eyefinity +
    HD3D +
    PowerTune +
    DualGraphics +
    ZeroCore +
    Switchable graphics +
    Mantle +
    Compute units 6
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