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    GeForce 840M vs Radeon HD 6990M Crossfire

    If you are going to buy a new graphics card and are choosing between GeForce 840M and Radeon HD 6990M Crossfire, 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 GeForce 840M stacks up against Radeon HD 6990M Crossfire, check out specs charts below.
    GeForce 840M Check Price
    Radeon HD 6990M Crossfire Check Price

    GeForce 840M and Radeon HD 6990M Crossfire are Laptop Graphics Cards

    Note: GeForce 840M and Radeon HD 6990M Crossfire 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 GeForce 840M or Radeon HD 6990M Crossfire here:

    GeForce 840M Laptops
    Radeon HD 6990M Crossfire Laptops

    Main Specs

      GeForce 840M Radeon HD 6990M Crossfire
    Power consumption (TDP) 33 Watt
    Interface PCIe 3.0 x8
    Memory type DDR3 GDDR5
    Maximum RAM amount 4 GB 2x2 GB
    Display Connectors No outputs
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    • GeForce 840M has 2 GB more memory, than Radeon HD 6990M Crossfire.
    • Both cards are used in Laptops.
    • GeForce 840M is build with Maxwell architecture, and Radeon HD 6990M Crossfire - with Terascale 2.
    • Core clock speed of GeForce 840M is 314 MHz higher, than Radeon HD 6990M Crossfire.
    • GeForce 840M is manufactured by 28 nm process technology, and Radeon HD 6990M Crossfire - by 40 nm process technology.
    • Memory clock speed of GeForce 840M is 1100 MHz higher, than Radeon HD 6990M Crossfire.

    Game benchmarks

    high / 1080p 1−2 35−40
    ultra / 1080p 0−1 21−24
    QHD / 1440p 0−1 16−18
    4K / 2160p − 10−11
    low / 720p 12−14 60−65
    medium / 1080p 3−4 40−45
    The average gaming FPS of Radeon HD 6990M Crossfire in Assassin's Creed Odyssey is 683% more, than GeForce 840M.

    Full Specs

      GeForce 840M Radeon HD 6990M Crossfire
    Architecture Maxwell Terascale 2
    Code name N15S-GT Blackcomb XTX
    Type Laptop Laptop
    Release date 12 March 2014 12 July 2011
    Pipelines 384 2240
    Core clock speed 1029 MHz 715 MHz
    Boost Clock 1124 MHz
    Transistor count 2x1700 Million
    Manufacturing process technology 28 nm 40 nm
    Texture fill rate 17.98
    Floating-point performance 863.2 gflops
    Memory bus width 64 Bit 256 Bit
    Memory clock speed 2000 MHz 900 MHz
    Memory bandwidth 16.02 GB/s
    Shared memory - -
    DirectX 12 (11_0) DirectX 11, Shader 5.0
    Shader Model 5.1
    OpenGL 4.5
    OpenCL 1.2
    Vulkan 1.1.126
    CUDA +
    Bus support PCI Express 2.0, PCI Express 3.0
    Bitcoin / BTC (SHA256) 92 Mh/s
    Laptop size medium sized large
    Optimus +
    GPU Boost 2.0
    GameWorks +
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