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    Mobility Radeon HD 3870 X2 vs Radeon HD 6990M Crossfire

    If you are going to buy a new graphics card and are choosing between Mobility Radeon HD 3870 X2 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 Mobility Radeon HD 3870 X2 stacks up against Radeon HD 6990M Crossfire, check out specs charts below.
    Mobility Radeon HD 3870 X2 Check Price
    Radeon HD 6990M Crossfire Check Price

    Mobility Radeon HD 3870 X2 and Radeon HD 6990M Crossfire are Laptop Graphics Cards

    Note: Mobility Radeon HD 3870 X2 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 Mobility Radeon HD 3870 X2 or Radeon HD 6990M Crossfire here:

    Mobility Radeon HD 3870 X2 Laptops
    Radeon HD 6990M Crossfire Laptops

    Main Specs

      Mobility Radeon HD 3870 X2 Radeon HD 6990M Crossfire
    Power consumption (TDP) 110 Watt
    Interface PCIe 2.0 x16
    Memory type GDDR3 GDDR5
    Maximum RAM amount 512 MB 2x2 GB
    Display Connectors No outputs
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    • Mobility Radeon HD 3870 X2 has 510 GB more memory, than Radeon HD 6990M Crossfire.
    • Both cards are used in Laptops.
    • Mobility Radeon HD 3870 X2 is build with RV6xx architecture, and Radeon HD 6990M Crossfire - with Terascale 2.
    • Core clock speed of Radeon HD 6990M Crossfire is 55 MHz higher, than Mobility Radeon HD 3870 X2.
    • Mobility Radeon HD 3870 X2 is manufactured by 55 nm process technology, and Radeon HD 6990M Crossfire - by 40 nm process technology.
    • Memory clock speed of Radeon HD 6990M Crossfire is 50 MHz higher, than Mobility Radeon HD 3870 X2.

    Game benchmarks

    high / 1080p 6−7 35−40
    ultra / 1080p 4−5 21−24
    QHD / 1440p 0−1 16−18
    4K / 2160p − 10−11
    low / 720p 16−18 60−65
    medium / 1080p 8−9 40−45
    The average gaming FPS of Radeon HD 6990M Crossfire in Assassin's Creed Odyssey is 355% more, than Mobility Radeon HD 3870 X2.

    Full Specs

      Mobility Radeon HD 3870 X2 Radeon HD 6990M Crossfire
    Architecture RV6xx Terascale 2
    Code name M88-XT CF Blackcomb XTX
    Type Laptop Laptop
    Release date 1 September 2008 12 July 2011
    Pipelines 640 2240
    Core clock speed 660 MHz 715 MHz
    Transistor count 666 million 2x1700 Million
    Manufacturing process technology 55 nm 40 nm
    Texture fill rate 10.56
    Floating-point performance 2x 422.4 gflops
    Memory bus width 256 Bit 256 Bit
    Memory clock speed 850 MHz 900 MHz
    Memory bandwidth 54.4 GB/s
    Shared memory - -
    DirectX 10.1 (10_1) DirectX 11, Shader 5.0
    Shader Model 4.1
    OpenGL 3.3
    OpenCL N/A
    Vulkan N/A
    Laptop size large large
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