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    Radeon HD 6990M Crossfire vs Radeon R7 M340

    If you are going to buy a new graphics card and are choosing between Radeon HD 6990M Crossfire and Radeon R7 M340, 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 Radeon HD 6990M Crossfire stacks up against Radeon R7 M340, check out specs charts below.
    Radeon HD 6990M Crossfire Check Price
    Radeon R7 M340 Check Price

    Radeon HD 6990M Crossfire and Radeon R7 M340 are Laptop Graphics Cards

    Note: Radeon HD 6990M Crossfire 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 6990M Crossfire or Radeon R7 M340 here:

    Radeon HD 6990M Crossfire Laptops
    Radeon R7 M340 Laptops

    Main Specs

      Radeon HD 6990M Crossfire Radeon R7 M340
    Interface PCIe 3.0 x8
    Supplementary power connectors None
    Memory type GDDR5 DDR3
    Maximum RAM amount 2x2 GB 4 GB
    Display Connectors No outputs
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    • Radeon R7 M340 has 2 GB more memory, than Radeon HD 6990M Crossfire.
    • Both cards are used in Laptops.
    • Radeon HD 6990M Crossfire is build with Terascale 2 architecture, and Radeon R7 M340 - with GCN.
    • Core clock speed of Radeon R7 M340 is 306 MHz higher, than Radeon HD 6990M Crossfire.
    • Radeon HD 6990M Crossfire is manufactured by 40 nm process technology, and Radeon R7 M340 - by 28 nm process technology.
    • Memory clock speed of Radeon R7 M340 is 100 MHz higher, than Radeon HD 6990M Crossfire.

    Game benchmarks

    high / 1080p 35−40 0−1
    ultra / 1080p 21−24 −
    QHD / 1440p 16−18 0−1
    4K / 2160p 10−11 −
    low / 720p 60−65 1−2
    medium / 1080p 40−45 0−1
    The average gaming FPS of Radeon HD 6990M Crossfire in Assassin's Creed Odyssey is 6100% more, than Radeon R7 M340.

    Full Specs

      Radeon HD 6990M Crossfire Radeon R7 M340
    Architecture Terascale 2 GCN
    Code name Blackcomb XTX Meso Pro DDR3
    Type Laptop Laptop
    Release date 12 July 2011 16 June 2015
    Pipelines 2240 320
    Core clock speed 715 MHz 1021 MHz
    Boost Clock 1021 MHz
    Transistor count 2x1700 Million 950 million
    Manufacturing process technology 40 nm 28 nm
    Texture fill rate 17.16
    Floating-point performance 549.1 gflops
    Memory bus width 256 Bit 128 Bit
    Memory clock speed 900 MHz 1000 MHz
    Memory bandwidth 16 GB/s
    Shared memory - -
    DirectX DirectX 11, Shader 5.0
    Shader Model 5.1
    OpenGL 4.4
    OpenCL Not Listed
    Vulkan +
    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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