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    Radeon HD 7870M vs Radeon R7 M340

    In this comparison between Radeon HD 7870M and Radeon R7 M340 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 Radeon HD 7870M will be the best choice, for others Radeon R7 M340 will be their preference. Study the comparison tables below and make your choice.
    Radeon HD 7870M Check Price
    Radeon R7 M340 Check Price

    Radeon HD 7870M and Radeon R7 M340 are Laptop Graphics Cards

    Note: Radeon HD 7870M 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 Radeon HD 7870M or Radeon R7 M340 here:

    Radeon HD 7870M Laptops
    Radeon R7 M340 Laptops

    Main Specs

      Radeon HD 7870M Radeon R7 M340
    Power consumption (TDP) 45 Watt
    Interface PCIe 3.0 x16 PCIe 3.0 x8
    Supplementary power connectors None
    Memory type GDDR5 DDR3
    Maximum RAM amount 2 GB 4 GB
    Display Connectors No outputs No outputs
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    • Radeon HD 7870M is connected by PCIe 3.0 x16, and Radeon R7 M340 uses PCIe 3.0 x8 interface.
    • Radeon R7 M340 has 2 GB more memory, than Radeon HD 7870M.
    • Both cards are used in Laptops.
    • Radeon HD 7870M and Radeon R7 M340 are build with GCN architecture.
    • Core clock speed of Radeon R7 M340 is 221 MHz higher, than Radeon HD 7870M.
    • Radeon HD 7870M and Radeon R7 M340 are manufactured by 28 nm process technology.
    • Memory clock speed of Radeon HD 7870M is 3000 MHz higher, than Radeon R7 M340.

    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 Radeon HD 7870M in Assassin's Creed Odyssey is 1600% more, than Radeon R7 M340.

    Full Specs

      Radeon HD 7870M Radeon R7 M340
    Architecture GCN GCN
    Code name Heathrow XT Meso Pro DDR3
    Type Laptop Laptop
    Release date 24 April 2012 16 June 2015
    Pipelines 640 320
    Core clock speed 800 MHz 1021 MHz
    Boost Clock 1021 MHz
    Transistor count 1,500 million 950 million
    Manufacturing process technology 28 nm 28 nm
    Texture fill rate 32.00 17.16
    Floating-point performance 1,024 gflops 549.1 gflops
    Memory bus width 128 Bit 128 Bit
    Memory clock speed 4000 MHz 1000 MHz
    Memory bandwidth 64 GB/s 16 GB/s
    Shared memory - -
    DirectX 12 (11_1)
    Shader Model 5.1 5.1
    OpenGL 4.6 4.4
    OpenCL 1.2 Not Listed
    Vulkan 1.2.131 +
    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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